Fix rendering of gtk menus
Convert paths to native in readdir function so that network drive can be open correctly.
Fix the comment.
fixes single file selection mode on Windows
Merge pull request #422 from adobe/jeff/fix-6840

Ensure that filenames returned when allowMultipleSelection = false are properly canonicalized
Merge pull request #421 from adobe/rlim/file-path-issue

Convert file paths to native paths before calling FindFirstFile.
Merge pull request #348 from MattSturgeon/linux-menus

Fix rendering of gtk menus