Well, here's what I did... And let me first say that I'm not good at this sort of thing. I converted the Atlantica.pk3 to a .zip. Then I went in and changed the name of the file that caused the error, so that it would have few enough characters in the title so that it wouldn't exceed the max. After seeing what both of you suggested, I think I was clearly not on the right path in my way of thinking. It didn't matter in the end anyway since I was unable to successfully convert the .zip back into a .pk3 (I changed the title from .zip to .pk3, but the file kept the .zip). So Szico, while I would do what you said and just delete the file, I wouldn't be able to convert it back into a .pk3 after I was done. Also, the problem with the Mac App version of the game is that it you have to open the SP version to get to the MP version of the game. It's strange. Moondog, I think I somewhat understand what you're saying, but I think I would run into the same problem I ran into before, where I can't convert it back to .pk3 after going in and editing...