How "deep" in the folder structure are you with the game? A "default" stock Steam install will be "C:\Program Files (x86) \Steam \SteamApps \common \Silent Hunter 4 Wolves of the Pacific \Data \Campains \Campaign \PatrolObjectives \Insertion Coast Watcher Bouganville \Insertion Coast Watcher Bouganville.mis" (and .tsr), well within the theoretical 255-260 character limit for Windows file/path names. For the Steam game to be modded, you have to move the Library to another path, of course, and mine ends up being a shorter path than Steam's original. Another reason might be the hard drive itself. Have you done a scan on it, and made certain that it doesn't have bad sectors (surely not)? Or how about write-protection?
