How big are these .dun files? Do you suspect they are some kind of zip-like (or rfd/rfh) like files, with files inside? Are there any files with the same name, but with a different extension (like rfd = file data & rfh = file header)? Or is it just the .dun file (dun = file data & header). Have a look at the .dun files with a hex editor, do you see any filenames? If there's a small .dun file, I'd be willing to have a look at it, perhaps I can decode the file format. I don't have the game (and don't plan on getting it since I don't have time to play it), so you'll have to send me a .dun file. If the .dun file is a file with only the models/script in hex format, then I don't think I can help.