.dac is a sound file. A converter to mp3, wav, etc is at
http://www.downloadjunction.com/prod...704/index.html
.sit is a file compressed by Stuffit. The free Expander for Macintosh and Windows is available at
www.stuffit.com
A useful place to seek out extensions is
http://filext.com/
Welcome - haven't seen you on the board before. Hope this is what you were looking for.
