ROMs won't work with UNC paths

[Jason Carr]

For some reason come in with file://. Why?

Games won't launch with file:// or //.

Check other types of games as well to enable UNC paths.

'An error occurred while trying to launch the game: URI formats are not supported.' It is unclear if it says URI (all capitals), or if maybe it should be URL but the L is lowercase.

That was reported as well, not sure how to reproduce.

[Jason Carr]

Imports were adding file: to the beginning; all problems go away when fixed. Changes the GetRelativePath method to not try to get a relative path if the path fed in is a network path.