There IS no "QuickTime.qtp" on Vista that I could find anywhere.
So to clarify, does this fix the audio dropping/stuttering problem, or just a movie-related crash?
Since XP does not have the sound stuttering issue, I can't confirm if it does anything for that particular Vista problem, it is only confirmed to fix the movie crash on XP. If the game is using QuickTime for the audio (somewhat unlikely), then it may help, but since I don't have Vista, I can't confirm that.
If Quicktime is installed, there must be a QuickTime.qtp in your profile somewhere. Since Vista replaced/changed the whole "Documents and Settings" deal that XP uses, I don't know where it could be though.