diff --git a/dlls/windowscodecs/info.c b/dlls/windowscodecs/info.c
index 373699d08c3..877ac4ae3c6 100644
--- a/dlls/windowscodecs/info.c
+++ b/dlls/windowscodecs/info.c
@@ -36,8 +36,34 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
 
+static WCHAR const mimetypes_valuename[] = {'M','i','m','e','T','y','p','e','s',0};
 static WCHAR const pixelformats_keyname[] = {'P','i','x','e','l','F','o','r','m','a','t','s',0};
 
+static HRESULT ComponentInfo_GetStringValue(HKEY classkey, LPCWSTR value,
+    UINT buffer_size, WCHAR *buffer, UINT *actual_size)
+{
+    LONG ret;
+    DWORD cbdata=buffer_size * sizeof(WCHAR);
+
+    if (!actual_size)
+        return E_INVALIDARG;
+
+    ret = RegGetValueW(classkey, NULL, value, RRF_RT_REG_SZ|RRF_NOEXPAND, NULL,
+        buffer, &cbdata);
+
+    if (ret == 0 || ret == ERROR_MORE_DATA)
+        *actual_size = cbdata/sizeof(WCHAR);
+
+    if (!buffer && buffer_size != 0)
+        /* Yes, native returns the correct size in this case. */
+        return E_INVALIDARG;
+
+    if (ret == ERROR_MORE_DATA)
+        return WINCODEC_ERR_INSUFFICIENTBUFFER;
+
+    return HRESULT_FROM_WIN32(ret);
+}
+
 typedef struct {
     const IWICBitmapDecoderInfoVtbl *lpIWICBitmapDecoderInfoVtbl;
     LONG ref;
@@ -188,8 +214,12 @@ static HRESULT WINAPI BitmapDecoderInfo_GetDeviceModels(IWICBitmapDecoderInfo *i
 static HRESULT WINAPI BitmapDecoderInfo_GetMimeTypes(IWICBitmapDecoderInfo *iface,
     UINT cchMimeTypes, WCHAR *wzMimeTypes, UINT *pcchActual)
 {
-    FIXME("(%p,%u,%p,%p): stub\n", iface, cchMimeTypes, wzMimeTypes, pcchActual);
-    return E_NOTIMPL;
+    BitmapDecoderInfo *This = (BitmapDecoderInfo*)iface;
+
+    TRACE("(%p,%u,%p,%p)\n", iface, cchMimeTypes, wzMimeTypes, pcchActual);
+
+    return ComponentInfo_GetStringValue(This->classkey, mimetypes_valuename,
+        cchMimeTypes, wzMimeTypes, pcchActual);
 }
 
 static HRESULT WINAPI BitmapDecoderInfo_GetFileExtensions(IWICBitmapDecoderInfo *iface,
@@ -616,8 +646,12 @@ static HRESULT WINAPI BitmapEncoderInfo_GetDeviceModels(IWICBitmapEncoderInfo *i
 static HRESULT WINAPI BitmapEncoderInfo_GetMimeTypes(IWICBitmapEncoderInfo *iface,
     UINT cchMimeTypes, WCHAR *wzMimeTypes, UINT *pcchActual)
 {
-    FIXME("(%p,%u,%p,%p): stub\n", iface, cchMimeTypes, wzMimeTypes, pcchActual);
-    return E_NOTIMPL;
+    BitmapEncoderInfo *This = (BitmapEncoderInfo*)iface;
+
+    TRACE("(%p,%u,%p,%p)\n", iface, cchMimeTypes, wzMimeTypes, pcchActual);
+
+    return ComponentInfo_GetStringValue(This->classkey, mimetypes_valuename,
+        cchMimeTypes, wzMimeTypes, pcchActual);
 }
 
 static HRESULT WINAPI BitmapEncoderInfo_GetFileExtensions(IWICBitmapEncoderInfo *iface,
diff --git a/dlls/windowscodecs/tests/info.c b/dlls/windowscodecs/tests/info.c
index 3e5b26ad4d9..74d2748f964 100644
--- a/dlls/windowscodecs/tests/info.c
+++ b/dlls/windowscodecs/tests/info.c
@@ -47,7 +47,6 @@ static void test_decoder_info(void)
     hr = IWICComponentInfo_QueryInterface(info, &IID_IWICBitmapDecoderInfo, (void**)&decoder_info);
     ok(hr == S_OK, "QueryInterface failed, hr=%x\n", hr);
 
-todo_wine {
     hr = IWICBitmapDecoderInfo_GetMimeTypes(decoder_info, 0, NULL, NULL);
     ok(hr == E_INVALIDARG, "GetMimeType failed, hr=%x\n", hr);
 
@@ -76,7 +75,6 @@ todo_wine {
     ok(hr == S_OK, "GetMimeType failed, hr=%x\n", hr);
     ok(lstrcmpW(value, expected_mimetype) == 0, "GetMimeType returned wrong value %s\n", wine_dbgstr_w(value));
     ok(len == lstrlenW(expected_mimetype)+1, "GetMimeType returned wrong len %i\n", len);
-}
 
     IWICBitmapDecoderInfo_Release(decoder_info);