diff --git a/dlls/winegstreamer/gst_private.h b/dlls/winegstreamer/gst_private.h
index 8b5183a95ee..7d5828a15d6 100644
--- a/dlls/winegstreamer/gst_private.h
+++ b/dlls/winegstreamer/gst_private.h
@@ -101,6 +101,8 @@ HRESULT decodebin_parser_create(IUnknown *outer, IUnknown **out) DECLSPEC_HIDDEN
 HRESULT mpeg_splitter_create(IUnknown *outer, IUnknown **out) DECLSPEC_HIDDEN;
 HRESULT wave_parser_create(IUnknown *outer, IUnknown **out) DECLSPEC_HIDDEN;
 
+bool amt_from_wg_format(AM_MEDIA_TYPE *mt, const struct wg_format *format);
+
 BOOL init_gstreamer(void) DECLSPEC_HIDDEN;
 
 extern HRESULT mfplat_get_class_object(REFCLSID rclsid, REFIID riid, void **obj) DECLSPEC_HIDDEN;
@@ -118,6 +120,7 @@ struct wm_stream
     struct wm_reader *reader;
     struct wg_parser_stream *wg_stream;
     WORD index;
+    struct wg_format format;
 };
 
 struct wm_reader
diff --git a/dlls/winegstreamer/quartz_parser.c b/dlls/winegstreamer/quartz_parser.c
index 6d79d2ef129..0862a75b7ef 100644
--- a/dlls/winegstreamer/quartz_parser.c
+++ b/dlls/winegstreamer/quartz_parser.c
@@ -343,7 +343,7 @@ static bool amt_from_wg_format_video(AM_MEDIA_TYPE *mt, const struct wg_format *
     return true;
 }
 
-static bool amt_from_wg_format(AM_MEDIA_TYPE *mt, const struct wg_format *format)
+bool amt_from_wg_format(AM_MEDIA_TYPE *mt, const struct wg_format *format)
 {
     memset(mt, 0, sizeof(*mt));
 
diff --git a/dlls/winegstreamer/wm_reader.c b/dlls/winegstreamer/wm_reader.c
index 682f9a2ae50..feb000c96ed 100644
--- a/dlls/winegstreamer/wm_reader.c
+++ b/dlls/winegstreamer/wm_reader.c
@@ -80,8 +80,26 @@ static ULONG WINAPI stream_config_Release(IWMStreamConfig *iface)
 
 static HRESULT WINAPI stream_config_GetStreamType(IWMStreamConfig *iface, GUID *type)
 {
-    FIXME("iface %p, type %p, stub!\n", iface, type);
-    return E_NOTIMPL;
+    struct stream_config *config = impl_from_IWMStreamConfig(iface);
+    struct wm_reader *reader = config->stream->reader;
+    AM_MEDIA_TYPE mt;
+
+    TRACE("config %p, type %p.\n", config, type);
+
+    EnterCriticalSection(&reader->cs);
+
+    if (!amt_from_wg_format(&mt, &config->stream->format))
+    {
+        LeaveCriticalSection(&reader->cs);
+        return E_OUTOFMEMORY;
+    }
+
+    *type = mt.majortype;
+    FreeMediaType(&mt);
+
+    LeaveCriticalSection(&reader->cs);
+
+    return S_OK;
 }
 
 static HRESULT WINAPI stream_config_GetStreamNumber(IWMStreamConfig *iface, WORD *number)
@@ -1047,6 +1065,7 @@ HRESULT wm_reader_open_stream(struct wm_reader *reader, IStream *stream)
         stream->wg_stream = wg_parser_get_stream(reader->wg_parser, i);
         stream->reader = reader;
         stream->index = i;
+        wg_parser_stream_get_preferred_format(stream->wg_stream, &stream->format);
     }
 
     LeaveCriticalSection(&reader->cs);
diff --git a/dlls/wmvcore/tests/wmvcore.c b/dlls/wmvcore/tests/wmvcore.c
index 385cda74aba..031a1841360 100644
--- a/dlls/wmvcore/tests/wmvcore.c
+++ b/dlls/wmvcore/tests/wmvcore.c
@@ -704,11 +704,11 @@ static void test_sync_reader_types(void)
         ok(stream_number == i + 1, "Got stream number %u.\n", stream_number);
 
         hr = IWMStreamConfig_GetStreamType(config, &majortype);
-        todo_wine ok(hr == S_OK, "Got hr %#x.\n", hr);
+        ok(hr == S_OK, "Got hr %#x.\n", hr);
         if (!i)
-            todo_wine ok(IsEqualGUID(&majortype, &MEDIATYPE_Video), "Got major type %s.\n", debugstr_guid(&majortype));
+            ok(IsEqualGUID(&majortype, &MEDIATYPE_Video), "Got major type %s.\n", debugstr_guid(&majortype));
         else
-            todo_wine ok(IsEqualGUID(&majortype, &MEDIATYPE_Audio), "Got major type %s.\n", debugstr_guid(&majortype));
+            ok(IsEqualGUID(&majortype, &MEDIATYPE_Audio), "Got major type %s.\n", debugstr_guid(&majortype));
 
         ref = IWMStreamConfig_Release(config);
         ok(!ref, "Got outstanding refcount %d.\n", ref);