diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 7681c6c5e..fc06c3e84 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -63,7 +63,7 @@ message Entry {
     bool is_directory = 2;
     repeated FileChunk chunks = 3;
     FuseAttributes attributes = 4;
-    map<string, string> extended = 5;
+    map<string, bytes> extended = 5;
 }
 
 message EventNotification {
@@ -100,6 +100,7 @@ message GetEntryAttributesRequest {
 message GetEntryAttributesResponse {
     FuseAttributes attributes = 1;
     repeated FileChunk chunks = 2;
+    map<string, bytes> extended = 3;
 }
 
 message GetFileContentRequest {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 70d63957b..27e5886c3 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -167,7 +167,7 @@ type Entry struct {
 	IsDirectory bool              `protobuf:"varint,2,opt,name=is_directory,json=isDirectory" json:"is_directory,omitempty"`
 	Chunks      []*FileChunk      `protobuf:"bytes,3,rep,name=chunks" json:"chunks,omitempty"`
 	Attributes  *FuseAttributes   `protobuf:"bytes,4,opt,name=attributes" json:"attributes,omitempty"`
-	Extended    map[string]string `protobuf:"bytes,5,rep,name=extended" json:"extended,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
+	Extended    map[string][]byte `protobuf:"bytes,5,rep,name=extended" json:"extended,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (m *Entry) Reset()                    { *m = Entry{} }
@@ -203,7 +203,7 @@ func (m *Entry) GetAttributes() *FuseAttributes {
 	return nil
 }
 
-func (m *Entry) GetExtended() map[string]string {
+func (m *Entry) GetExtended() map[string][]byte {
 	if m != nil {
 		return m.Extended
 	}
@@ -395,8 +395,9 @@ func (m *GetEntryAttributesRequest) GetFileId() string {
 }
 
 type GetEntryAttributesResponse struct {
-	Attributes *FuseAttributes `protobuf:"bytes,1,opt,name=attributes" json:"attributes,omitempty"`
-	Chunks     []*FileChunk    `protobuf:"bytes,2,rep,name=chunks" json:"chunks,omitempty"`
+	Attributes *FuseAttributes   `protobuf:"bytes,1,opt,name=attributes" json:"attributes,omitempty"`
+	Chunks     []*FileChunk      `protobuf:"bytes,2,rep,name=chunks" json:"chunks,omitempty"`
+	Extended   map[string][]byte `protobuf:"bytes,3,rep,name=extended" json:"extended,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (m *GetEntryAttributesResponse) Reset()                    { *m = GetEntryAttributesResponse{} }
@@ -418,6 +419,13 @@ func (m *GetEntryAttributesResponse) GetChunks() []*FileChunk {
 	return nil
 }
 
+func (m *GetEntryAttributesResponse) GetExtended() map[string][]byte {
+	if m != nil {
+		return m.Extended
+	}
+	return nil
+}
+
 type GetFileContentRequest struct {
 	FileId string `protobuf:"bytes,1,opt,name=file_id,json=fileId" json:"file_id,omitempty"`
 }
@@ -1122,80 +1130,81 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 1187 bytes of a gzipped FileDescriptorProto
+	// 1202 bytes of a gzipped FileDescriptorProto
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+	0x00, 0x00,
 }
diff --git a/weed/s3api/filer_multipart.go b/weed/s3api/filer_multipart.go
index d85a94326..cd5b2e118 100644
--- a/weed/s3api/filer_multipart.go
+++ b/weed/s3api/filer_multipart.go
@@ -14,9 +14,9 @@ func (s3a *S3ApiServer) createMultipartUpload(input *s3.CreateMultipartUploadInp
 
 	if err := s3a.mkdir(s3a.genUploadsFolder(*input.Bucket), uploadIdString, func(entry *filer_pb.Entry) {
 		if entry.Extended == nil {
-			entry.Extended = make(map[string]string)
+			entry.Extended = make(map[string][]byte)
 		}
-		entry.Extended["key"] = *input.Key
+		entry.Extended["key"] = []byte(*input.Key)
 	}); err != nil {
 		glog.Errorf("NewMultipartUpload error: %v", err)
 		return nil, ErrInternalError
@@ -57,7 +57,7 @@ func (s3a *S3ApiServer) listMultipartUploads(input *s3.ListMultipartUploadsInput
 		if entry.Extended != nil {
 			key := entry.Extended["key"]
 			output.Uploads = append(output.Uploads, &s3.MultipartUpload{
-				Key:      aws.String(key),
+				Key:      aws.String(string(key)),
 				UploadId: aws.String(entry.Name),
 			})
 		}