https://bugs.winehq.org/show_bug.cgi?id=38468
--- Comment #2 from Yajo yajo@openaliasbox.org ---
So there's hope that Wine can turn these into drive letters and thus 'hide' the colon in the path.
That would be great, in fact it's how Windows works.
The only workaround I found for now is to manually symlink those locations to a place without comma.