http://bugs.winehq.org/show_bug.cgi?id=58757
--- Comment #8 from Nikolay Sivov bunglehead@gmail.com --- Yes, that sounds important.
Regarding metadata, we have some support for metadata blocks of various types. There is no support for XMP (xml-based metadata content), and also no support for what's called "policy expressions", which is what happens in this log - comma-separate names like System.Photo.xxxx. Presumably that gets translated to a query, depending on metadata format.
Anyway, metadata support is unlikely an issue I think.