Can't do that without some controlling interface.
If you like Snip then you will love IrfanView - get plugins too.
During install do not give it any file associations, you can add those later as desired.
IrfanView - Free
Rob - Supporting Member, Cascade Bicycle Club P.O. Box 15165 Seattle, WA. 98115-0165 206-522-3222 and 24 hr hotline 206-522-BIKE http://www.cascade.org