Remove force_unicode and allow either unicode or bytes to be passed in to path and used directly.
Use GetFileAttributesExW instead of GetFileAttributesExW which handles both unicode and bytes, instead of current which could only read bytes.
Make path default to unicode, as was specified in the doc.
more docs
Merge branch 'master' of https://github.com/kivy/kivy into filechooser-unicode-win
Merge pull request #1818 from matham/filechooser-unicode-win

Fix filchooser issues