Do you mean you have the game in:
C:\SteamApps\common\Silent Hunter...
- OR:
C:\Program Files (x86)\Steam Apps\common\Silent Hunter...
It makes a big difference to Windows where you put it.
Depending on the version of FotRS, you will encounter the occasional CTD. The later in the game, the more frequent. We are currently working on updating the mod, and calling it
Fall of the Rising Sun Ultimate, if you'd like to try it out. One thing that is an obscure trivia point about the game is that you shouldn't 'mix' game saves with a different mod, so if you go to play the new version, don't load any old saves...