[Edi]

Unfortunately the FAQ entry assumes Windows, since I have no experience using a Mac. It should be the same, though someone who actually uses a Mac and knows how it works would be in a better position to comment.

As far as text editors, map and mod files made with Notepad tend to be screwed up because it uses non-Unix endlines. Crimson Editor for example makes mod and map files that do not suffer any problems. Notepad++ and various other free text editors would also work.