Esme Povirk (@madewokherd) commented about dlls/windowscodecs/tests/metadata.c:
len = 0xdeadbeef; hr = WICMapGuidToShortName(&GUID_MetadataFormatIMD, 256, name, &len); ok(hr == S_OK, "WICMapGuidToShortName error %#lx\n", hr);
ok(!lstrcmpW(name, imgdescW), "wrong short name %s\n", wine_dbgstr_w(name));
ok(!lstrcmpW(name, L"imgdesc"), "wrong short name %s\n", wine_dbgstr_w(name)); format = GUID_NULL;
hr = WICMapShortNameToGuid(imgdescW, &format);
hr = WICMapShortNameToGuid(name, &format);
Why replace this with a variable instead of a constant?