Actually there are many things which will get you in trouble with cross-platform filenames. Another example beside of the backslash would be the colon (illegal in Windows and on the Mac). But when you do cross-platform stuff, you forbid anyway a certain set of characters which might get you in trouble (/\@:[]*, just to name a few), so this would be a "garbage in - garbage out" problem anyway, so this is not something I would worry.