diff --git a/picture.go b/picture.go
index f8133ca..8e2fa12 100644
--- a/picture.go
+++ b/picture.go
@@ -366,7 +366,7 @@ func (f *File) addMedia(file []byte, ext string) string {
 // setContentTypePartImageExtensions provides a function to set the content
 // type for relationship parts and the Main Document part.
 func (f *File) setContentTypePartImageExtensions() {
-	imageTypes := map[string]string{"jpeg": "image/", "png": "image/", "gif": "image/", "tiff": "image/", "emf": "image/x-"}
+	imageTypes := map[string]string{"jpeg": "image/", "png": "image/", "gif": "image/", "tiff": "image/", "emf": "image/x-", "wmf": "image/x-"}
 	content := f.contentTypesReader()
 	content.Lock()
 	defer content.Unlock()
diff --git a/picture_test.go b/picture_test.go
index c548035..60c6ac1 100644
--- a/picture_test.go
+++ b/picture_test.go
@@ -97,7 +97,9 @@ func TestAddPictureErrors(t *testing.T) {
 	decode := func(r io.Reader) (image.Image, error) { return nil, nil }
 	decodeConfig := func(r io.Reader) (image.Config, error) { return image.Config{Height: 100, Width: 90}, nil }
 	image.RegisterFormat("emf", "", decode, decodeConfig)
+	image.RegisterFormat("wmf", "", decode, decodeConfig)
 	assert.NoError(t, f.AddPicture("Sheet1", "Q1", filepath.Join("test", "images", "excel.emf"), ""))
+	assert.NoError(t, f.AddPicture("Sheet1", "Q7", filepath.Join("test", "images", "excel.wmf"), ""))
 	assert.NoError(t, f.SaveAs(filepath.Join("test", "TestAddPicture2.xlsx")))
 	assert.NoError(t, f.Close())
 }
diff --git a/test/images/excel.wmf b/test/images/excel.wmf
new file mode 100644
index 0000000..fd588c6
Binary files /dev/null and b/test/images/excel.wmf differ
diff --git a/xmlDrawing.go b/xmlDrawing.go
index 7d0b2df..0b6df05 100644
--- a/xmlDrawing.go
+++ b/xmlDrawing.go
@@ -119,7 +119,7 @@ const (
 )
 
 // supportedImageTypes defined supported image types.
-var supportedImageTypes = map[string]string{".gif": ".gif", ".jpg": ".jpeg", ".jpeg": ".jpeg", ".png": ".png", ".tif": ".tiff", ".tiff": ".tiff", ".emf": ".emf"}
+var supportedImageTypes = map[string]string{".gif": ".gif", ".jpg": ".jpeg", ".jpeg": ".jpeg", ".png": ".png", ".tif": ".tiff", ".tiff": ".tiff", ".emf": ".emf", ".wmf": ".wmf"}
 
 // xlsxCNvPr directly maps the cNvPr (Non-Visual Drawing Properties). This
 // element specifies non-visual canvas properties. This allows for additional