mfplat: Allow deleting open files.

dlls/mfplat/main.c

@@ -4407,7 +4407,7 @@ HRESULT WINAPI MFCreateFile(MF_FILE_ACCESSMODE accessmode, MF_FILE_OPENMODE open
 {
     DWORD capabilities = MFBYTESTREAM_IS_SEEKABLE | MFBYTESTREAM_DOES_NOT_USE_NETWORK;
     DWORD filecreation_disposition = 0, fileaccessmode = 0, fileattributes = 0;
-    DWORD filesharemode = FILE_SHARE_READ;
+    DWORD filesharemode = FILE_SHARE_READ | FILE_SHARE_DELETE;
     struct bytestream *object;
     FILETIME writetime;
     HANDLE file;

dlls/mfplat/tests/mfplat.c

@@ -2077,10 +2077,14 @@ static void test_file_stream(void)
     hr = MFCreateFile(MF_ACCESSMODE_READ, MF_OPENMODE_FAIL_IF_NOT_EXIST, MF_FILEFLAGS_NONE, pathW, &bytestream);
     ok(FAILED(hr), "Unexpected hr %#x.\n", hr);
 
+    hr = MFCreateFile(MF_ACCESSMODE_READ, MF_OPENMODE_FAIL_IF_NOT_EXIST, MF_FILEFLAGS_NONE, filename, &bytestream);
+    ok(hr == S_OK, "got 0x%08x\n", hr);
+    ok(DeleteFileW(filename), "failed to delete file\n");
+    IMFByteStream_Release(bytestream);
+
     hr = MFShutdown();
     ok(hr == S_OK, "Failed to shut down, hr %#x.\n", hr);
 
-    DeleteFileW(filename);
     DeleteFileW(newfilename);
 }