You should always use backslashes in Window's filenames, while in many cases a forward slash will work, a backslash is the proper file separator character for Windows. Linux uses the forward slash. Also some Emu's have changed in respect to needing the double quotes in some cases over the years, so you may or may not need them depending on the version. So I would try Frequency's suggestions. EDIT: I can see the profile included in GameEx doesn't have the double quotes, so this may be the emulator that changed the need for them.