winecfg: add owner to file picker dialogs, making them modal

[Jason Overland]

Supersedes 110308 (winecfg: improve user experience by adding all Windows versions and accompanying error message).

My previous patches apparently had issues with spaces -- this time I'm attaching rather than inlining the patch.  As far as I can tell, this works sending it to myself, but I'm still keeping my fingers crossed...
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