Also there's apparently some problems with the music, particularly the music in the in-game videos, in Worms 2. One of the top-rated reviews of the game (the two-star review) highlighted this and it's mentioned here too:
You can't don anything about the videos: they've been badly encoded from the beginning.
If you own the CD version, you can re-encode the .avi from the CD to .wmv and put them in your worms2 folder instead of the GOG-provided ones. I did my re-enconding with winff (a wrapper around libav/ffmpeg), and it works well.