Interop: Fix an issue with the path being presented in the system codepath. Using UTF-8 now which should fix a number of issues with characters not displaying or passing-through correctly.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5907 b64f7644-9d1e-0410-96f1-a4d463321fa5
WinGui: Undo the Preview Change from last checkin.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5908 b64f7644-9d1e-0410-96f1-a4d463321fa5