diff --git a/flytecopilot/cmd/download.go b/flytecopilot/cmd/download.go
index 3827308c335..abf3531e8ce 100644
--- a/flytecopilot/cmd/download.go
+++ b/flytecopilot/cmd/download.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/golang/protobuf/proto"
 	"github.com/spf13/cobra"
 
 	"github.com/flyteorg/flyte/flytecopilot/data"
@@ -49,6 +50,11 @@ func GetUploadModeVals() []string {
 }
 
 func (d *DownloadOptions) Download(ctx context.Context) error {
+	variableMap := &core.VariableMap{}
+	if err := proto.Unmarshal(d.inputInterface, variableMap); err != nil {
+		logger.Warnf(ctx, "Bad input interface passed, failed to unmarshal err: %s", err)
+	}
+
 	if d.remoteOutputsPrefix == "" {
 		return fmt.Errorf("to-output-prefix is required")
 	}
@@ -77,7 +83,7 @@ func (d *DownloadOptions) Download(ctx context.Context) error {
 			childCtx, cancelFn = context.WithTimeout(ctx, d.timeout)
 		}
 		defer cancelFn()
-		err := dl.DownloadInputs(childCtx, storage.DataReference(d.remoteInputsPath), d.localDirectoryPath)
+		err := dl.DownloadInputs(childCtx, variableMap, storage.DataReference(d.remoteInputsPath), d.localDirectoryPath)
 		if err != nil {
 			logger.Errorf(ctx, "Downloading failed, err %s", err)
 			return err
@@ -116,6 +122,6 @@ func NewDownloadCommand(opts *RootOptions) *cobra.Command {
 	downloadCmd.Flags().StringVarP(&downloadOpts.metadataFormat, "format", "m", core.DataLoadingConfig_JSON.String(), fmt.Sprintf("What should be the output format for the primitive and structured types. Options [%v]", GetFormatVals()))
 	downloadCmd.Flags().StringVarP(&downloadOpts.downloadMode, "download-mode", "d", core.IOStrategy_DOWNLOAD_EAGER.String(), fmt.Sprintf("Download mode to use. Options [%v]", GetDownloadModeVals()))
 	downloadCmd.Flags().DurationVarP(&downloadOpts.timeout, "timeout", "t", time.Hour*1, "Max time to allow for downloads to complete, default is 1H")
-	downloadCmd.Flags().BytesBase64VarP(&downloadOpts.inputInterface, "input-interface", "i", nil, "Input interface proto message - core.VariableMap, base64 encoced string")
+	downloadCmd.Flags().BytesBase64VarP(&downloadOpts.inputInterface, "input-interface", "i", nil, "Input interface proto message - core.VariableMap, base64 encoded string")
 	return downloadCmd
 }
diff --git a/flytecopilot/cmd/download_test.go b/flytecopilot/cmd/download_test.go
index b96ffd46a60..d30bd7b63c2 100644
--- a/flytecopilot/cmd/download_test.go
+++ b/flytecopilot/cmd/download_test.go
@@ -10,6 +10,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/golang/protobuf/proto"
 	"github.com/stretchr/testify/assert"
 
 	"github.com/flyteorg/flyte/flyteidl/clients/go/coreutils"
@@ -137,6 +138,100 @@ func TestDownloadOptions_Download(t *testing.T) {
 		assert.ElementsMatch(t, []string{"inputs.json", "inputs.pb", "x", "y", "blob"}, collectFile(tmpDir))
 	})
 
+	t.Run("primitiveAndBlobInputsWithFileExtension", func(t *testing.T) {
+		tmpDir, err := ioutil.TempDir(tmpFolderLocation, tmpPrefix)
+		assert.NoError(t, err)
+		defer func() {
+			assert.NoError(t, os.RemoveAll(tmpDir))
+		}()
+		dopts.localDirectoryPath = tmpDir
+
+		s := promutils.NewTestScope()
+		store, err := storage.NewDataStore(&storage.Config{Type: storage.TypeMemory}, s.NewSubScope("storage"))
+		assert.NoError(t, err)
+		dopts.RootOptions = &RootOptions{
+			Scope: s,
+			Store: store,
+		}
+
+		iface := &core.VariableMap{
+			Variables: map[string]*core.Variable{
+				"blob": {
+					Type: &core.LiteralType{Type: &core.LiteralType_Blob{Blob: &core.BlobType{Dimensionality: core.BlobType_SINGLE, Format: "xyz", FileExtension: "xyz"}}},
+				},
+				"csv_blob": {
+					Type: &core.LiteralType{Type: &core.LiteralType_Blob{Blob: &core.BlobType{Dimensionality: core.BlobType_SINGLE, Format: "csv", FileExtension: "csv"}}},
+				},
+				"invalid_extension_blob": {
+					Type: &core.LiteralType{Type: &core.LiteralType_Blob{Blob: &core.BlobType{Dimensionality: core.BlobType_SINGLE, Format: "xyz", FileExtension: "/../../../invalid"}}},
+				},
+			},
+		}
+		d, err := proto.Marshal(iface)
+		assert.NoError(t, err)
+		dopts.inputInterface = d
+
+		blobLoc := storage.DataReference("blob-loc")
+		br := bytes.NewBuffer([]byte("Hello World!"))
+		assert.NoError(t, store.WriteRaw(ctx, blobLoc, int64(br.Len()), storage.Options{}, br))
+		assert.NoError(t, store.WriteProtobuf(ctx, storage.DataReference(inputPath), storage.Options{}, &core.LiteralMap{
+			Literals: map[string]*core.Literal{
+				"x": coreutils.MustMakePrimitiveLiteral(1),
+				"y": coreutils.MustMakePrimitiveLiteral("hello"),
+				"blob": {Value: &core.Literal_Scalar{
+					Scalar: &core.Scalar{
+						Value: &core.Scalar_Blob{
+							Blob: &core.Blob{
+								Uri: blobLoc.String(),
+								Metadata: &core.BlobMetadata{
+									Type: &core.BlobType{
+										Dimensionality: core.BlobType_SINGLE,
+										Format:         "xyz",
+										FileExtension:  "xyz",
+									},
+								},
+							},
+						},
+					},
+				}},
+				"csv_blob": {Value: &core.Literal_Scalar{
+					Scalar: &core.Scalar{
+						Value: &core.Scalar_Blob{
+							Blob: &core.Blob{
+								Uri: blobLoc.String(),
+								Metadata: &core.BlobMetadata{
+									Type: &core.BlobType{
+										Dimensionality: core.BlobType_SINGLE,
+										Format:         "xyz",
+										FileExtension:  "xyz",
+									},
+								},
+							},
+						},
+					},
+				}},
+				"invalid_extension_blob": {Value: &core.Literal_Scalar{
+					Scalar: &core.Scalar{
+						Value: &core.Scalar_Blob{
+							Blob: &core.Blob{
+								Uri: blobLoc.String(),
+								Metadata: &core.BlobMetadata{
+									Type: &core.BlobType{
+										Dimensionality: core.BlobType_SINGLE,
+										Format:         "xyz",
+										FileExtension:  "/../../../invalid",
+									},
+								},
+							},
+						},
+					},
+				}},
+			},
+		}))
+		assert.NoError(t, dopts.Download(ctx), "Download Operation failed")
+		assert.ElementsMatch(t, []string{"inputs.json", "inputs.pb", "x", "y", "blob.xyz", "csv_blob.csv", "invalid_extension_blob"}, collectFile(tmpDir))
+	})
+
 	t.Run("primitiveAndMissingBlobInputs", func(t *testing.T) {
 		tmpDir, err := ioutil.TempDir(tmpFolderLocation, tmpPrefix)
 		assert.NoError(t, err)
diff --git a/flytecopilot/data/download.go b/flytecopilot/data/download.go
index 084469faed2..025b895e718 100644
--- a/flytecopilot/data/download.go
+++ b/flytecopilot/data/download.go
@@ -9,6 +9,7 @@ import (
 	"path"
 	"path/filepath"
 	"reflect"
+	"regexp"
 	"strconv"
 	"strings"
 	"sync"
@@ -26,6 +27,8 @@ import (
 	"github.com/flyteorg/flyte/flytestdlib/storage"
 )
 
+var validFileExtensionRe = regexp.MustCompile(`^[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)*$`)
+
 type Downloader struct {
 	format core.DataLoadingConfig_LiteralMapFormat
 	store  *storage.DataStore
@@ -33,6 +36,37 @@ type Downloader struct {
 	mode core.IOStrategy_DownloadMode
 }
 
+// By default, blobs (FlyteFiles) were not and still are not written with a
+// file extension. For example, a data: FlyteFile["csv"] blob is written
+// to "inputs/data", even though Format="csv".
+//
+// When FileExtension="" (the default), this old behavior is preserved.
+//
+// However, an input blob
+// `data: Annotated[FlyteFile["csv"], FileDownloadConfig(file_extension="csv")]`
+// should be written to "inputs/data.csv" (when FileExtension="csv" - new behavior).
+func resolveVarFilenames(ctx context.Context, vars *core.VariableMap) map[string]string {
+	varFilenames := make(map[string]string, len(vars.GetVariables()))
+	for varName, variable := range vars.GetVariables() {
+		varType := variable.GetType()
+		switch varType.GetType().(type) {
+		case *core.LiteralType_Blob:
+			ext := varType.GetBlob().GetFileExtension()
+			if ext == "" {
+				varFilenames[varName] = varName
+			} else if !validFileExtensionRe.MatchString(ext) {
+				logger.Warnf(ctx, "invalid file extension for variable %q [%q], ignoring...", varName, ext)
+				varFilenames[varName] = varName
+			} else {
+				varFilenames[varName] = varName + "." + ext
+			}
+		default:
+			varFilenames[varName] = varName
+		}
+	}
+	return varFilenames
+}
+
 // TODO add timeout and rate limit
 // TODO use chunk to download
 func (d Downloader) handleBlob(ctx context.Context, blob *core.Blob, toPath string) (interface{}, error) {
@@ -432,7 +466,7 @@ func (d Downloader) handleLiteral(ctx context.Context, lit *core.Literal, filePa
 		if err != nil {
 			return nil, nil, errors.Wrapf(err, "failed to create directory [%s]", filePath)
 		}
-		v, m, err := d.RecursiveDownload(ctx, lit.GetMap(), filePath, writeToFile)
+		v, m, err := d.RecursiveDownload(ctx, lit.GetMap(), filePath, make(map[string]string), writeToFile)
 		if err != nil {
 			return nil, nil, err
 		}
@@ -468,7 +502,7 @@ type downloadedResult struct {
 	v   interface{}
 }
 
-func (d Downloader) RecursiveDownload(ctx context.Context, inputs *core.LiteralMap, dir string, writePrimitiveToFile bool) (VarMap, *core.LiteralMap, error) {
+func (d Downloader) RecursiveDownload(ctx context.Context, inputs *core.LiteralMap, dir string, varFilenames map[string]string, writePrimitiveToFile bool) (VarMap, *core.LiteralMap, error) {
 	childCtx, cancel := context.WithCancel(ctx)
 	defer cancel()
 	if inputs == nil || len(inputs.GetLiterals()) == 0 {
@@ -486,7 +520,11 @@ func (d Downloader) RecursiveDownload(ctx context.Context, inputs *core.LiteralM
 			}
 			logger.Infof(ctx, "read object at location [%s]", offloadedMetadataURI)
 		}
-		varPath := path.Join(dir, variable)
+		filename := variable
+		if varFilename, ok := varFilenames[variable]; ok {
+			filename = varFilename
+		}
+		varPath := path.Join(dir, filename)
 		lit := literal
 		f[variable] = futures.NewAsyncFuture(childCtx, func(ctx2 context.Context) (interface{}, error) {
 			v, lit, err := d.handleLiteral(ctx2, lit, varPath, writePrimitiveToFile)
@@ -520,7 +558,7 @@ func (d Downloader) RecursiveDownload(ctx context.Context, inputs *core.LiteralM
 	return vmap, m, nil
 }
 
-func (d Downloader) DownloadInputs(ctx context.Context, inputRef storage.DataReference, outputDir string) error {
+func (d Downloader) DownloadInputs(ctx context.Context, vars *core.VariableMap, inputRef storage.DataReference, outputDir string) error {
 	logger.Infof(ctx, "Downloading inputs from [%s]", inputRef)
 	defer logger.Infof(ctx, "Exited downloading inputs from [%s]", inputRef)
 	if err := os.MkdirAll(outputDir, os.ModePerm); err != nil {
@@ -533,7 +571,9 @@ func (d Downloader) DownloadInputs(ctx context.Context, inputRef storage.DataRef
 		logger.Errorf(ctx, "Failed to download inputs from [%s], err [%s]", inputRef, err)
 		return errors.Wrapf(err, "failed to download input metadata message from remote store")
 	}
-	varMap, lMap, err := d.RecursiveDownload(ctx, inputs, outputDir, true)
+
+	varFilenames := resolveVarFilenames(ctx, vars)
+	varMap, lMap, err := d.RecursiveDownload(ctx, inputs, outputDir, varFilenames, true)
 	if err != nil {
 		return errors.Wrapf(err, "failed to download input variable from remote store")
 	}
diff --git a/flytecopilot/data/download_test.go b/flytecopilot/data/download_test.go
index 1da5602e2c9..0a1481fcefa 100644
--- a/flytecopilot/data/download_test.go
+++ b/flytecopilot/data/download_test.go
@@ -231,7 +231,7 @@ func TestRecursiveDownload(t *testing.T) {
 			}
 		}()
 
-		varMap, lMap, err := d.RecursiveDownload(context.Background(), inputs, toPath, true)
+		varMap, lMap, err := d.RecursiveDownload(context.Background(), inputs, toPath, make(map[string]string), true)
 		assert.NoError(t, err)
 		assert.NotNil(t, varMap)
 		assert.NotNil(t, lMap)
@@ -309,7 +309,7 @@ func TestRecursiveDownload(t *testing.T) {
 			}
 		}()
 
-		varMap, lMap, err := d.RecursiveDownload(context.Background(), inputs, toPath, true)
+		varMap, lMap, err := d.RecursiveDownload(context.Background(), inputs, toPath, make(map[string]string), true)
 		assert.NoError(t, err)
 		assert.NotNil(t, varMap)
 		assert.NotNil(t, lMap)
diff --git a/flytecopilot/data/upload.go b/flytecopilot/data/upload.go
index 2103028d287..0362a78038a 100644
--- a/flytecopilot/data/upload.go
+++ b/flytecopilot/data/upload.go
@@ -107,11 +107,11 @@ func (u Uploader) handleBlobType(ctx context.Context, localPath string, toPath s
 			}
 		}
 
-		return coreutils.MakeLiteralForBlob(toPath, false, ""), nil
+		return coreutils.MakeLiteralForBlob(toPath, false, "", ""), nil
 	}
 	size := info.Size()
 	// Should we make this a go routine as well, so that we can introduce timeouts
-	return coreutils.MakeLiteralForBlob(toPath, false, ""), UploadFileToStorage(ctx, fpath, toPath, size, u.store)
+	return coreutils.MakeLiteralForBlob(toPath, false, "", ""), UploadFileToStorage(ctx, fpath, toPath, size, u.store)
 }
 
 func (u Uploader) RecursiveUpload(ctx context.Context, vars *core.VariableMap, fromPath string, metaOutputPath, dataRawPath storage.DataReference) error {
diff --git a/flyteidl/.gitignore b/flyteidl/.gitignore
index f7a920620fd..a666666dbbc 100644
--- a/flyteidl/.gitignore
+++ b/flyteidl/.gitignore
@@ -8,6 +8,9 @@ vendor
 
 dist
 gen/pb_python/flyteidl.egg-info/
+gen/pb_python/flyteidl/**/__pycache__/
+pip-wheel-metadata/*.dist-info/
+*.egg-info/
 
 .virtualgo
 docs/build/
diff --git a/flyteidl/clients/go/assets/admin.swagger.json b/flyteidl/clients/go/assets/admin.swagger.json
index 4f0b9e77d55..b7d4c9e5e05 100644
--- a/flyteidl/clients/go/assets/admin.swagger.json
+++ b/flyteidl/clients/go/assets/admin.swagger.json
@@ -6861,6 +6861,10 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") appended to the blob filename during flytecopilot download.\nUnlike \"format\", this field is not used for type validation in SDK.\nIt only controls the local filename when materializing to disk."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/clients/go/coreutils/literals.go b/flyteidl/clients/go/coreutils/literals.go
index 310e389c733..a5c8d18ac07 100644
--- a/flyteidl/clients/go/coreutils/literals.go
+++ b/flyteidl/clients/go/coreutils/literals.go
@@ -485,7 +485,7 @@ func MakeLiteralForStructuredDataSet(path storage.DataReference, columns []*core
 	}
 }
 
-func MakeLiteralForBlob(path storage.DataReference, isDir bool, format string) *core.Literal {
+func MakeLiteralForBlob(path storage.DataReference, isDir bool, format string, fileExtension string) *core.Literal {
 	dim := core.BlobType_SINGLE
 	if isDir {
 		dim = core.BlobType_MULTIPART
@@ -500,6 +500,7 @@ func MakeLiteralForBlob(path storage.DataReference, isDir bool, format string) *
 							Type: &core.BlobType{
 								Dimensionality: dim,
 								Format:         format,
+								FileExtension:  fileExtension,
 							},
 						},
 					},
@@ -601,7 +602,7 @@ func MakeLiteralForType(t *core.LiteralType, v interface{}) (*core.Literal, erro
 
 	case *core.LiteralType_Blob:
 		isDir := newT.Blob.GetDimensionality() == core.BlobType_MULTIPART
-		lv := MakeLiteralForBlob(storage.DataReference(fmt.Sprintf("%v", v)), isDir, newT.Blob.GetFormat())
+		lv := MakeLiteralForBlob(storage.DataReference(fmt.Sprintf("%v", v)), isDir, newT.Blob.GetFormat(), newT.Blob.GetFileExtension())
 		return lv, nil
 
 	case *core.LiteralType_Schema:
diff --git a/flyteidl/clients/go/coreutils/literals_test.go b/flyteidl/clients/go/coreutils/literals_test.go
index 3586e0e02fc..fe06d4dc416 100644
--- a/flyteidl/clients/go/coreutils/literals_test.go
+++ b/flyteidl/clients/go/coreutils/literals_test.go
@@ -388,9 +388,10 @@ func TestMakeLiteralForSimpleType(t *testing.T) {
 
 func TestMakeLiteralForBlob(t *testing.T) {
 	type args struct {
-		path   storage.DataReference
-		isDir  bool
-		format string
+		path          storage.DataReference
+		isDir         bool
+		format        string
+		fileExtension string
 	}
 	tests := []struct {
 		name string
@@ -399,10 +400,11 @@ func TestMakeLiteralForBlob(t *testing.T) {
 	}{
 		{"simple-key", args{path: "/key", isDir: false, format: "xyz"}, &core.Blob{Uri: "/key", Metadata: &core.BlobMetadata{Type: &core.BlobType{Format: "xyz", Dimensionality: core.BlobType_SINGLE}}}},
 		{"simple-dir", args{path: "/key", isDir: true, format: "xyz"}, &core.Blob{Uri: "/key", Metadata: &core.BlobMetadata{Type: &core.BlobType{Format: "xyz", Dimensionality: core.BlobType_MULTIPART}}}},
+		{"simple-key-with-extension", args{path: "/key", isDir: false, format: "xyz", fileExtension: "xyz"}, &core.Blob{Uri: "/key", Metadata: &core.BlobMetadata{Type: &core.BlobType{Format: "xyz", Dimensionality: core.BlobType_SINGLE, FileExtension: "xyz"}}}},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			if got := MakeLiteralForBlob(tt.args.path, tt.args.isDir, tt.args.format); !reflect.DeepEqual(got.GetScalar().GetBlob(), tt.want) {
+			if got := MakeLiteralForBlob(tt.args.path, tt.args.isDir, tt.args.format, tt.args.fileExtension); !reflect.DeepEqual(got.GetScalar().GetBlob(), tt.want) {
 				t.Errorf("MakeLiteralForBlob() = %v, want %v", got, tt.want)
 			}
 		})
diff --git a/flyteidl/gen/pb-es/flyteidl/core/types_pb.ts b/flyteidl/gen/pb-es/flyteidl/core/types_pb.ts
index f311fa0692b..97b669b0aba 100644
--- a/flyteidl/gen/pb-es/flyteidl/core/types_pb.ts
+++ b/flyteidl/gen/pb-es/flyteidl/core/types_pb.ts
@@ -341,6 +341,15 @@ export class BlobType extends Message<BlobType> {
    */
   dimensionality = BlobType_BlobDimensionality.SINGLE;
 
+  /**
+   * Optional file extension (e.g. "csv", "parquet") appended to the blob filename during flytecopilot download.
+   * Unlike "format", this field is not used for type validation in SDK.
+   * It only controls the local filename when materializing to disk.
+   *
+   * @generated from field: string file_extension = 3;
+   */
+  fileExtension = "";
+
   constructor(data?: PartialMessage<BlobType>) {
     super();
     proto3.util.initPartial(data, this);
@@ -351,6 +360,7 @@ export class BlobType extends Message<BlobType> {
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
     { no: 1, name: "format", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 2, name: "dimensionality", kind: "enum", T: proto3.getEnumType(BlobType_BlobDimensionality) },
+    { no: 3, name: "file_extension", kind: "scalar", T: 9 /* ScalarType.STRING */ },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): BlobType {
diff --git a/flyteidl/gen/pb-go/flyteidl/core/types.pb.go b/flyteidl/gen/pb-go/flyteidl/core/types.pb.go
index b844e951c93..ae1010e8a72 100644
--- a/flyteidl/gen/pb-go/flyteidl/core/types.pb.go
+++ b/flyteidl/gen/pb-go/flyteidl/core/types.pb.go
@@ -334,6 +334,10 @@ type BlobType struct {
 	// csv, parquet etc
 	Format         string                      `protobuf:"bytes,1,opt,name=format,proto3" json:"format,omitempty"`
 	Dimensionality BlobType_BlobDimensionality `protobuf:"varint,2,opt,name=dimensionality,proto3,enum=flyteidl.core.BlobType_BlobDimensionality" json:"dimensionality,omitempty"`
+	// Optional file extension (e.g. "csv", "parquet") appended to the blob filename during flytecopilot download.
+	// Unlike "format", this field is not used for type validation in SDK.
+	// It only controls the local filename when materializing to disk.
+	FileExtension string `protobuf:"bytes,3,opt,name=file_extension,json=fileExtension,proto3" json:"file_extension,omitempty"`
 }
 
 func (x *BlobType) Reset() {
@@ -382,6 +386,13 @@ func (x *BlobType) GetDimensionality() BlobType_BlobDimensionality {
 	return BlobType_SINGLE
 }
 
+func (x *BlobType) GetFileExtension() string {
+	if x != nil {
+		return x.FileExtension
+	}
+	return ""
+}
+
 // Enables declaring enum types, with predefined string values
 // For len(values) > 0, the first value in the ordered list is regarded as the default value. If you wish
 // To provide no defaults, make the first value as undefined.
@@ -1176,125 +1187,127 @@ var file_flyteidl_core_types_proto_rawDesc = []byte{
 	0x61, 0x6c, 0x5f, 0x74, 0x79, 0x70, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1a, 0x2e,
 	0x66, 0x6c, 0x79, 0x74, 0x65, 0x69, 0x64, 0x6c, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e, 0x4c, 0x69,
 	0x74, 0x65, 0x72, 0x61, 0x6c, 0x54, 0x79, 0x70, 0x65, 0x52, 0x0b, 0x6c, 0x69, 0x74, 0x65, 0x72,
-	0x61, 0x6c, 0x54, 0x79, 0x70, 0x65, 0x22, 0xa7, 0x01, 0x0a, 0x08, 0x42, 0x6c, 0x6f, 0x62, 0x54,
+	0x61, 0x6c, 0x54, 0x79, 0x70, 0x65, 0x22, 0xce, 0x01, 0x0a, 0x08, 0x42, 0x6c, 0x6f, 0x62, 0x54,
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+	0x79, 0x74, 0x65, 0x69, 0x64, 0x6c, 0x2e, 0x43, 0x6f, 0x72, 0x65, 0xca, 0x02, 0x0d, 0x46, 0x6c,
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+	0x79, 0x74, 0x65, 0x69, 0x64, 0x6c, 0x5c, 0x43, 0x6f, 0x72, 0x65, 0x5c, 0x47, 0x50, 0x42, 0x4d,
+	0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0xea, 0x02, 0x0e, 0x46, 0x6c, 0x79, 0x74, 0x65, 0x69,
+	0x64, 0x6c, 0x3a, 0x3a, 0x43, 0x6f, 0x72, 0x65, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/cacheservice/cacheservice.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/cacheservice/cacheservice.swagger.json
index 204e9e71223..ffaa2b701b8 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/cacheservice/cacheservice.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/cacheservice/cacheservice.swagger.json
@@ -156,6 +156,10 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") appended to the blob filename during flytecopilot download.\nUnlike \"format\", this field is not used for type validation in SDK.\nIt only controls the local filename when materializing to disk."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/datacatalog/datacatalog.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/datacatalog/datacatalog.swagger.json
index 990cc1ec4ae..7991be94fb6 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/datacatalog/datacatalog.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/datacatalog/datacatalog.swagger.json
@@ -130,6 +130,10 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") appended to the blob filename during flytecopilot download.\nUnlike \"format\", this field is not used for type validation in SDK.\nIt only controls the local filename when materializing to disk."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/service/admin.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/service/admin.swagger.json
index 4f0b9e77d55..b7d4c9e5e05 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/service/admin.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/service/admin.swagger.json
@@ -6861,6 +6861,10 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") appended to the blob filename during flytecopilot download.\nUnlike \"format\", this field is not used for type validation in SDK.\nIt only controls the local filename when materializing to disk."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/service/agent.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/service/agent.swagger.json
index 7752341446a..bbba1f620cb 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/service/agent.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/service/agent.swagger.json
@@ -1024,6 +1024,10 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") appended to the blob filename during flytecopilot download.\nUnlike \"format\", this field is not used for type validation in SDK.\nIt only controls the local filename when materializing to disk."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/service/dataproxy.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/service/dataproxy.swagger.json
index 20f32b743d0..f8637e59fc5 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/service/dataproxy.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/service/dataproxy.swagger.json
@@ -246,6 +246,10 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") appended to the blob filename during flytecopilot download.\nUnlike \"format\", this field is not used for type validation in SDK.\nIt only controls the local filename when materializing to disk."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/service/external_plugin_service.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/service/external_plugin_service.swagger.json
index 468030f76d2..12826f2ee38 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/service/external_plugin_service.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/service/external_plugin_service.swagger.json
@@ -272,6 +272,10 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") appended to the blob filename during flytecopilot download.\nUnlike \"format\", this field is not used for type validation in SDK.\nIt only controls the local filename when materializing to disk."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-go/gateway/flyteidl/service/signal.swagger.json b/flyteidl/gen/pb-go/gateway/flyteidl/service/signal.swagger.json
index 841cb04f267..6dda2afc15f 100644
--- a/flyteidl/gen/pb-go/gateway/flyteidl/service/signal.swagger.json
+++ b/flyteidl/gen/pb-go/gateway/flyteidl/service/signal.swagger.json
@@ -322,6 +322,10 @@
         },
         "dimensionality": {
           "$ref": "#/definitions/BlobTypeBlobDimensionality"
+        },
+        "file_extension": {
+          "type": "string",
+          "description": "Optional file extension (e.g. \"csv\", \"parquet\") appended to the blob filename during flytecopilot download.\nUnlike \"format\", this field is not used for type validation in SDK.\nIt only controls the local filename when materializing to disk."
         }
       },
       "title": "Defines type behavior for blob objects"
diff --git a/flyteidl/gen/pb-js/flyteidl.d.ts b/flyteidl/gen/pb-js/flyteidl.d.ts
index e0e9f2b539f..23da5b15bdc 100644
--- a/flyteidl/gen/pb-js/flyteidl.d.ts
+++ b/flyteidl/gen/pb-js/flyteidl.d.ts
@@ -2174,6 +2174,9 @@ export namespace flyteidl {
 
             /** BlobType dimensionality */
             dimensionality?: (flyteidl.core.BlobType.BlobDimensionality|null);
+
+            /** BlobType fileExtension */
+            fileExtension?: (string|null);
         }
 
         /** Represents a BlobType. */
@@ -2191,6 +2194,9 @@ export namespace flyteidl {
             /** BlobType dimensionality. */
             public dimensionality: flyteidl.core.BlobType.BlobDimensionality;
 
+            /** BlobType fileExtension. */
+            public fileExtension: string;
+
             /**
              * Creates a new BlobType instance using the specified properties.
              * @param [properties] Properties to set
diff --git a/flyteidl/gen/pb-js/flyteidl.js b/flyteidl/gen/pb-js/flyteidl.js
index 310354ae309..73f40aaf33c 100644
--- a/flyteidl/gen/pb-js/flyteidl.js
+++ b/flyteidl/gen/pb-js/flyteidl.js
@@ -5147,6 +5147,7 @@
                  * @interface IBlobType
                  * @property {string|null} [format] BlobType format
                  * @property {flyteidl.core.BlobType.BlobDimensionality|null} [dimensionality] BlobType dimensionality
+                 * @property {string|null} [fileExtension] BlobType fileExtension
                  */
     
                 /**
@@ -5180,6 +5181,14 @@
                  */
                 BlobType.prototype.dimensionality = 0;
     
+                /**
+                 * BlobType fileExtension.
+                 * @member {string} fileExtension
+                 * @memberof flyteidl.core.BlobType
+                 * @instance
+                 */
+                BlobType.prototype.fileExtension = "";
+    
                 /**
                  * Creates a new BlobType instance using the specified properties.
                  * @function create
@@ -5208,6 +5217,8 @@
                         writer.uint32(/* id 1, wireType 2 =*/10).string(message.format);
                     if (message.dimensionality != null && message.hasOwnProperty("dimensionality"))
                         writer.uint32(/* id 2, wireType 0 =*/16).int32(message.dimensionality);
+                    if (message.fileExtension != null && message.hasOwnProperty("fileExtension"))
+                        writer.uint32(/* id 3, wireType 2 =*/26).string(message.fileExtension);
                     return writer;
                 };
     
@@ -5235,6 +5246,9 @@
                         case 2:
                             message.dimensionality = reader.int32();
                             break;
+                        case 3:
+                            message.fileExtension = reader.string();
+                            break;
                         default:
                             reader.skipType(tag & 7);
                             break;
@@ -5265,6 +5279,9 @@
                         case 1:
                             break;
                         }
+                    if (message.fileExtension != null && message.hasOwnProperty("fileExtension"))
+                        if (!$util.isString(message.fileExtension))
+                            return "fileExtension: string expected";
                     return null;
                 };
     
diff --git a/flyteidl/gen/pb_python/flyteidl/core/types_pb2.py b/flyteidl/gen/pb_python/flyteidl/core/types_pb2.py
index 3043a0cf6b8..ffc8d641418 100644
--- a/flyteidl/gen/pb_python/flyteidl/core/types_pb2.py
+++ b/flyteidl/gen/pb_python/flyteidl/core/types_pb2.py
@@ -14,7 +14,7 @@
 from google.protobuf import struct_pb2 as google_dot_protobuf_dot_struct__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x19\x66lyteidl/core/types.proto\x12\rflyteidl.core\x1a\x1cgoogle/protobuf/struct.proto\"\xa1\x02\n\nSchemaType\x12@\n\x07\x63olumns\x18\x03 \x03(\x0b\x32&.flyteidl.core.SchemaType.SchemaColumnR\x07\x63olumns\x1a\xd0\x01\n\x0cSchemaColumn\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12K\n\x04type\x18\x02 \x01(\x0e\x32\x37.flyteidl.core.SchemaType.SchemaColumn.SchemaColumnTypeR\x04type\"_\n\x10SchemaColumnType\x12\x0b\n\x07INTEGER\x10\x00\x12\t\n\x05\x46LOAT\x10\x01\x12\n\n\x06STRING\x10\x02\x12\x0b\n\x07\x42OOLEAN\x10\x03\x12\x0c\n\x08\x44\x41TETIME\x10\x04\x12\x0c\n\x08\x44URATION\x10\x05\"\xc7\x02\n\x15StructuredDatasetType\x12L\n\x07\x63olumns\x18\x01 \x03(\x0b\x32\x32.flyteidl.core.StructuredDatasetType.DatasetColumnR\x07\x63olumns\x12\x16\n\x06\x66ormat\x18\x02 \x01(\tR\x06\x66ormat\x12\x30\n\x14\x65xternal_schema_type\x18\x03 \x01(\tR\x12\x65xternalSchemaType\x12\x32\n\x15\x65xternal_schema_bytes\x18\x04 \x01(\x0cR\x13\x65xternalSchemaBytes\x1a\x62\n\rDatasetColumn\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12=\n\x0cliteral_type\x18\x02 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x0bliteralType\"\xa7\x01\n\x08\x42lobType\x12\x16\n\x06\x66ormat\x18\x01 \x01(\tR\x06\x66ormat\x12R\n\x0e\x64imensionality\x18\x02 \x01(\x0e\x32*.flyteidl.core.BlobType.BlobDimensionalityR\x0e\x64imensionality\"/\n\x12\x42lobDimensionality\x12\n\n\x06SINGLE\x10\x00\x12\r\n\tMULTIPART\x10\x01\"\"\n\x08\x45numType\x12\x16\n\x06values\x18\x01 \x03(\tR\x06values\"C\n\tUnionType\x12\x36\n\x08variants\x18\x01 \x03(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x08variants\"\xd7\x01\n\rTypeStructure\x12\x10\n\x03tag\x18\x01 \x01(\tR\x03tag\x12V\n\x0e\x64\x61taclass_type\x18\x02 \x03(\x0b\x32/.flyteidl.core.TypeStructure.DataclassTypeEntryR\rdataclassType\x1a\\\n\x12\x44\x61taclassTypeEntry\x12\x10\n\x03key\x18\x01 \x01(\tR\x03key\x12\x30\n\x05value\x18\x02 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x05value:\x02\x38\x01\"K\n\x0eTypeAnnotation\x12\x39\n\x0b\x61nnotations\x18\x01 \x01(\x0b\x32\x17.google.protobuf.StructR\x0b\x61nnotations\"\xbc\x05\n\x0bLiteralType\x12\x33\n\x06simple\x18\x01 \x01(\x0e\x32\x19.flyteidl.core.SimpleTypeH\x00R\x06simple\x12\x33\n\x06schema\x18\x02 \x01(\x0b\x32\x19.flyteidl.core.SchemaTypeH\x00R\x06schema\x12\x45\n\x0f\x63ollection_type\x18\x03 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeH\x00R\x0e\x63ollectionType\x12\x42\n\x0emap_value_type\x18\x04 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeH\x00R\x0cmapValueType\x12-\n\x04\x62lob\x18\x05 \x01(\x0b\x32\x17.flyteidl.core.BlobTypeH\x00R\x04\x62lob\x12\x36\n\tenum_type\x18\x07 \x01(\x0b\x32\x17.flyteidl.core.EnumTypeH\x00R\x08\x65numType\x12^\n\x17structured_dataset_type\x18\x08 \x01(\x0b\x32$.flyteidl.core.StructuredDatasetTypeH\x00R\x15structuredDatasetType\x12\x39\n\nunion_type\x18\n \x01(\x0b\x32\x18.flyteidl.core.UnionTypeH\x00R\tunionType\x12\x33\n\x08metadata\x18\x06 \x01(\x0b\x32\x17.google.protobuf.StructR\x08metadata\x12=\n\nannotation\x18\t \x01(\x0b\x32\x1d.flyteidl.core.TypeAnnotationR\nannotation\x12:\n\tstructure\x18\x0b \x01(\x0b\x32\x1c.flyteidl.core.TypeStructureR\tstructureB\x06\n\x04type\"z\n\x0fOutputReference\x12\x17\n\x07node_id\x18\x01 \x01(\tR\x06nodeId\x12\x10\n\x03var\x18\x02 \x01(\tR\x03var\x12<\n\tattr_path\x18\x03 \x03(\x0b\x32\x1f.flyteidl.core.PromiseAttributeR\x08\x61ttrPath\"_\n\x10PromiseAttribute\x12#\n\x0cstring_value\x18\x01 \x01(\tH\x00R\x0bstringValue\x12\x1d\n\tint_value\x18\x02 \x01(\x05H\x00R\x08intValueB\x07\n\x05value\"G\n\x05\x45rror\x12$\n\x0e\x66\x61iled_node_id\x18\x01 \x01(\tR\x0c\x66\x61iledNodeId\x12\x18\n\x07message\x18\x02 \x01(\tR\x07message*\x86\x01\n\nSimpleType\x12\x08\n\x04NONE\x10\x00\x12\x0b\n\x07INTEGER\x10\x01\x12\t\n\x05\x46LOAT\x10\x02\x12\n\n\x06STRING\x10\x03\x12\x0b\n\x07\x42OOLEAN\x10\x04\x12\x0c\n\x08\x44\x41TETIME\x10\x05\x12\x0c\n\x08\x44URATION\x10\x06\x12\n\n\x06\x42INARY\x10\x07\x12\t\n\x05\x45RROR\x10\x08\x12\n\n\x06STRUCT\x10\tB\xb0\x01\n\x11\x63om.flyteidl.coreB\nTypesProtoP\x01Z:github.com/flyteorg/flyte/flyteidl/gen/pb-go/flyteidl/core\xa2\x02\x03\x46\x43X\xaa\x02\rFlyteidl.Core\xca\x02\rFlyteidl\\Core\xe2\x02\x19\x46lyteidl\\Core\\GPBMetadata\xea\x02\x0e\x46lyteidl::Coreb\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x19\x66lyteidl/core/types.proto\x12\rflyteidl.core\x1a\x1cgoogle/protobuf/struct.proto\"\xa1\x02\n\nSchemaType\x12@\n\x07\x63olumns\x18\x03 \x03(\x0b\x32&.flyteidl.core.SchemaType.SchemaColumnR\x07\x63olumns\x1a\xd0\x01\n\x0cSchemaColumn\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12K\n\x04type\x18\x02 \x01(\x0e\x32\x37.flyteidl.core.SchemaType.SchemaColumn.SchemaColumnTypeR\x04type\"_\n\x10SchemaColumnType\x12\x0b\n\x07INTEGER\x10\x00\x12\t\n\x05\x46LOAT\x10\x01\x12\n\n\x06STRING\x10\x02\x12\x0b\n\x07\x42OOLEAN\x10\x03\x12\x0c\n\x08\x44\x41TETIME\x10\x04\x12\x0c\n\x08\x44URATION\x10\x05\"\xc7\x02\n\x15StructuredDatasetType\x12L\n\x07\x63olumns\x18\x01 \x03(\x0b\x32\x32.flyteidl.core.StructuredDatasetType.DatasetColumnR\x07\x63olumns\x12\x16\n\x06\x66ormat\x18\x02 \x01(\tR\x06\x66ormat\x12\x30\n\x14\x65xternal_schema_type\x18\x03 \x01(\tR\x12\x65xternalSchemaType\x12\x32\n\x15\x65xternal_schema_bytes\x18\x04 \x01(\x0cR\x13\x65xternalSchemaBytes\x1a\x62\n\rDatasetColumn\x12\x12\n\x04name\x18\x01 \x01(\tR\x04name\x12=\n\x0cliteral_type\x18\x02 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x0bliteralType\"\xce\x01\n\x08\x42lobType\x12\x16\n\x06\x66ormat\x18\x01 \x01(\tR\x06\x66ormat\x12R\n\x0e\x64imensionality\x18\x02 \x01(\x0e\x32*.flyteidl.core.BlobType.BlobDimensionalityR\x0e\x64imensionality\x12%\n\x0e\x66ile_extension\x18\x03 \x01(\tR\rfileExtension\"/\n\x12\x42lobDimensionality\x12\n\n\x06SINGLE\x10\x00\x12\r\n\tMULTIPART\x10\x01\"\"\n\x08\x45numType\x12\x16\n\x06values\x18\x01 \x03(\tR\x06values\"C\n\tUnionType\x12\x36\n\x08variants\x18\x01 \x03(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x08variants\"\xd7\x01\n\rTypeStructure\x12\x10\n\x03tag\x18\x01 \x01(\tR\x03tag\x12V\n\x0e\x64\x61taclass_type\x18\x02 \x03(\x0b\x32/.flyteidl.core.TypeStructure.DataclassTypeEntryR\rdataclassType\x1a\\\n\x12\x44\x61taclassTypeEntry\x12\x10\n\x03key\x18\x01 \x01(\tR\x03key\x12\x30\n\x05value\x18\x02 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeR\x05value:\x02\x38\x01\"K\n\x0eTypeAnnotation\x12\x39\n\x0b\x61nnotations\x18\x01 \x01(\x0b\x32\x17.google.protobuf.StructR\x0b\x61nnotations\"\xbc\x05\n\x0bLiteralType\x12\x33\n\x06simple\x18\x01 \x01(\x0e\x32\x19.flyteidl.core.SimpleTypeH\x00R\x06simple\x12\x33\n\x06schema\x18\x02 \x01(\x0b\x32\x19.flyteidl.core.SchemaTypeH\x00R\x06schema\x12\x45\n\x0f\x63ollection_type\x18\x03 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeH\x00R\x0e\x63ollectionType\x12\x42\n\x0emap_value_type\x18\x04 \x01(\x0b\x32\x1a.flyteidl.core.LiteralTypeH\x00R\x0cmapValueType\x12-\n\x04\x62lob\x18\x05 \x01(\x0b\x32\x17.flyteidl.core.BlobTypeH\x00R\x04\x62lob\x12\x36\n\tenum_type\x18\x07 \x01(\x0b\x32\x17.flyteidl.core.EnumTypeH\x00R\x08\x65numType\x12^\n\x17structured_dataset_type\x18\x08 \x01(\x0b\x32$.flyteidl.core.StructuredDatasetTypeH\x00R\x15structuredDatasetType\x12\x39\n\nunion_type\x18\n \x01(\x0b\x32\x18.flyteidl.core.UnionTypeH\x00R\tunionType\x12\x33\n\x08metadata\x18\x06 \x01(\x0b\x32\x17.google.protobuf.StructR\x08metadata\x12=\n\nannotation\x18\t \x01(\x0b\x32\x1d.flyteidl.core.TypeAnnotationR\nannotation\x12:\n\tstructure\x18\x0b \x01(\x0b\x32\x1c.flyteidl.core.TypeStructureR\tstructureB\x06\n\x04type\"z\n\x0fOutputReference\x12\x17\n\x07node_id\x18\x01 \x01(\tR\x06nodeId\x12\x10\n\x03var\x18\x02 \x01(\tR\x03var\x12<\n\tattr_path\x18\x03 \x03(\x0b\x32\x1f.flyteidl.core.PromiseAttributeR\x08\x61ttrPath\"_\n\x10PromiseAttribute\x12#\n\x0cstring_value\x18\x01 \x01(\tH\x00R\x0bstringValue\x12\x1d\n\tint_value\x18\x02 \x01(\x05H\x00R\x08intValueB\x07\n\x05value\"G\n\x05\x45rror\x12$\n\x0e\x66\x61iled_node_id\x18\x01 \x01(\tR\x0c\x66\x61iledNodeId\x12\x18\n\x07message\x18\x02 \x01(\tR\x07message*\x86\x01\n\nSimpleType\x12\x08\n\x04NONE\x10\x00\x12\x0b\n\x07INTEGER\x10\x01\x12\t\n\x05\x46LOAT\x10\x02\x12\n\n\x06STRING\x10\x03\x12\x0b\n\x07\x42OOLEAN\x10\x04\x12\x0c\n\x08\x44\x41TETIME\x10\x05\x12\x0c\n\x08\x44URATION\x10\x06\x12\n\n\x06\x42INARY\x10\x07\x12\t\n\x05\x45RROR\x10\x08\x12\n\n\x06STRUCT\x10\tB\xb0\x01\n\x11\x63om.flyteidl.coreB\nTypesProtoP\x01Z:github.com/flyteorg/flyte/flyteidl/gen/pb-go/flyteidl/core\xa2\x02\x03\x46\x43X\xaa\x02\rFlyteidl.Core\xca\x02\rFlyteidl\\Core\xe2\x02\x19\x46lyteidl\\Core\\GPBMetadata\xea\x02\x0e\x46lyteidl::Coreb\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -25,8 +25,8 @@
   DESCRIPTOR._serialized_options = b'\n\021com.flyteidl.coreB\nTypesProtoP\001Z:github.com/flyteorg/flyte/flyteidl/gen/pb-go/flyteidl/core\242\002\003FCX\252\002\rFlyteidl.Core\312\002\rFlyteidl\\Core\342\002\031Flyteidl\\Core\\GPBMetadata\352\002\016Flyteidl::Core'
   _TYPESTRUCTURE_DATACLASSTYPEENTRY._options = None
   _TYPESTRUCTURE_DATACLASSTYPEENTRY._serialized_options = b'8\001'
-  _globals['_SIMPLETYPE']._serialized_start=2264
-  _globals['_SIMPLETYPE']._serialized_end=2398
+  _globals['_SIMPLETYPE']._serialized_start=2303
+  _globals['_SIMPLETYPE']._serialized_end=2437
   _globals['_SCHEMATYPE']._serialized_start=75
   _globals['_SCHEMATYPE']._serialized_end=364
   _globals['_SCHEMATYPE_SCHEMACOLUMN']._serialized_start=156
@@ -38,25 +38,25 @@
   _globals['_STRUCTUREDDATASETTYPE_DATASETCOLUMN']._serialized_start=596
   _globals['_STRUCTUREDDATASETTYPE_DATASETCOLUMN']._serialized_end=694
   _globals['_BLOBTYPE']._serialized_start=697
-  _globals['_BLOBTYPE']._serialized_end=864
-  _globals['_BLOBTYPE_BLOBDIMENSIONALITY']._serialized_start=817
-  _globals['_BLOBTYPE_BLOBDIMENSIONALITY']._serialized_end=864
-  _globals['_ENUMTYPE']._serialized_start=866
-  _globals['_ENUMTYPE']._serialized_end=900
-  _globals['_UNIONTYPE']._serialized_start=902
-  _globals['_UNIONTYPE']._serialized_end=969
-  _globals['_TYPESTRUCTURE']._serialized_start=972
-  _globals['_TYPESTRUCTURE']._serialized_end=1187
-  _globals['_TYPESTRUCTURE_DATACLASSTYPEENTRY']._serialized_start=1095
-  _globals['_TYPESTRUCTURE_DATACLASSTYPEENTRY']._serialized_end=1187
-  _globals['_TYPEANNOTATION']._serialized_start=1189
-  _globals['_TYPEANNOTATION']._serialized_end=1264
-  _globals['_LITERALTYPE']._serialized_start=1267
-  _globals['_LITERALTYPE']._serialized_end=1967
-  _globals['_OUTPUTREFERENCE']._serialized_start=1969
-  _globals['_OUTPUTREFERENCE']._serialized_end=2091
-  _globals['_PROMISEATTRIBUTE']._serialized_start=2093
-  _globals['_PROMISEATTRIBUTE']._serialized_end=2188
-  _globals['_ERROR']._serialized_start=2190
-  _globals['_ERROR']._serialized_end=2261
+  _globals['_BLOBTYPE']._serialized_end=903
+  _globals['_BLOBTYPE_BLOBDIMENSIONALITY']._serialized_start=856
+  _globals['_BLOBTYPE_BLOBDIMENSIONALITY']._serialized_end=903
+  _globals['_ENUMTYPE']._serialized_start=905
+  _globals['_ENUMTYPE']._serialized_end=939
+  _globals['_UNIONTYPE']._serialized_start=941
+  _globals['_UNIONTYPE']._serialized_end=1008
+  _globals['_TYPESTRUCTURE']._serialized_start=1011
+  _globals['_TYPESTRUCTURE']._serialized_end=1226
+  _globals['_TYPESTRUCTURE_DATACLASSTYPEENTRY']._serialized_start=1134
+  _globals['_TYPESTRUCTURE_DATACLASSTYPEENTRY']._serialized_end=1226
+  _globals['_TYPEANNOTATION']._serialized_start=1228
+  _globals['_TYPEANNOTATION']._serialized_end=1303
+  _globals['_LITERALTYPE']._serialized_start=1306
+  _globals['_LITERALTYPE']._serialized_end=2006
+  _globals['_OUTPUTREFERENCE']._serialized_start=2008
+  _globals['_OUTPUTREFERENCE']._serialized_end=2130
+  _globals['_PROMISEATTRIBUTE']._serialized_start=2132
+  _globals['_PROMISEATTRIBUTE']._serialized_end=2227
+  _globals['_ERROR']._serialized_start=2229
+  _globals['_ERROR']._serialized_end=2300
 # @@protoc_insertion_point(module_scope)
diff --git a/flyteidl/gen/pb_python/flyteidl/core/types_pb2.pyi b/flyteidl/gen/pb_python/flyteidl/core/types_pb2.pyi
index 9028afabd55..8cf40aa4927 100644
--- a/flyteidl/gen/pb_python/flyteidl/core/types_pb2.pyi
+++ b/flyteidl/gen/pb_python/flyteidl/core/types_pb2.pyi
@@ -77,7 +77,7 @@ class StructuredDatasetType(_message.Message):
     def __init__(self, columns: _Optional[_Iterable[_Union[StructuredDatasetType.DatasetColumn, _Mapping]]] = ..., format: _Optional[str] = ..., external_schema_type: _Optional[str] = ..., external_schema_bytes: _Optional[bytes] = ...) -> None: ...
 
 class BlobType(_message.Message):
-    __slots__ = ["format", "dimensionality"]
+    __slots__ = ["format", "dimensionality", "file_extension"]
     class BlobDimensionality(int, metaclass=_enum_type_wrapper.EnumTypeWrapper):
         __slots__ = []
         SINGLE: _ClassVar[BlobType.BlobDimensionality]
@@ -86,9 +86,11 @@ class BlobType(_message.Message):
     MULTIPART: BlobType.BlobDimensionality
     FORMAT_FIELD_NUMBER: _ClassVar[int]
     DIMENSIONALITY_FIELD_NUMBER: _ClassVar[int]
+    FILE_EXTENSION_FIELD_NUMBER: _ClassVar[int]
     format: str
     dimensionality: BlobType.BlobDimensionality
-    def __init__(self, format: _Optional[str] = ..., dimensionality: _Optional[_Union[BlobType.BlobDimensionality, str]] = ...) -> None: ...
+    file_extension: str
+    def __init__(self, format: _Optional[str] = ..., dimensionality: _Optional[_Union[BlobType.BlobDimensionality, str]] = ..., file_extension: _Optional[str] = ...) -> None: ...
 
 class EnumType(_message.Message):
     __slots__ = ["values"]
diff --git a/flyteidl/gen/pb_rust/flyteidl.core.rs b/flyteidl/gen/pb_rust/flyteidl.core.rs
index f3163496bd4..94f9f125c91 100644
--- a/flyteidl/gen/pb_rust/flyteidl.core.rs
+++ b/flyteidl/gen/pb_rust/flyteidl.core.rs
@@ -105,6 +105,11 @@ pub struct BlobType {
     pub format: ::prost::alloc::string::String,
     #[prost(enumeration="blob_type::BlobDimensionality", tag="2")]
     pub dimensionality: i32,
+    /// Optional file extension (e.g. "csv", "parquet") appended to the blob filename during flytecopilot download.
+    /// Unlike "format", this field is not used for type validation in SDK.
+    /// It only controls the local filename when materializing to disk.
+    #[prost(string, tag="3")]
+    pub file_extension: ::prost::alloc::string::String,
 }
 /// Nested message and enum types in `BlobType`.
 pub mod blob_type {
diff --git a/flyteidl/protos/flyteidl/core/types.proto b/flyteidl/protos/flyteidl/core/types.proto
index 3580eea9f00..330d38836c3 100644
--- a/flyteidl/protos/flyteidl/core/types.proto
+++ b/flyteidl/protos/flyteidl/core/types.proto
@@ -80,6 +80,11 @@ message BlobType {
     // csv, parquet etc
     string format = 1;
     BlobDimensionality dimensionality = 2;
+
+    // Optional file extension (e.g. "csv", "parquet") appended to the blob filename during flytecopilot download.
+    // Unlike "format", this field is not used for type validation in SDK.
+    // It only controls the local filename when materializing to disk.
+    string file_extension = 3;
 }
 
 // Enables declaring enum types, with predefined string values