Audio files?

Hi there,

Sorry for posting this here, I don't see a more appropriate venue and the forums at totalwar.com seem to be down every time I check there.

Had MTWII installed, was working fine, no apparent problems at all. A few days ago, I installed Nero 7 and foolishly let it change some file associations for, particularly audio files. Now the game crashes within a turn or two of playing with nonspecific error. My assumption is that the audio file associations are the issue. What did the .dat files reference before hand? I've tried uninstalling, with no success.