Thanks Tomcat (and Bret)

Irfanview also showed up on that Google search, about third or fourth on the list, but I just downloaded the first prog I investigated.

Can Irfanview do file conversions in bulk?
That would make it worth an additional download. The one I have will do conversions at the push of a button but only one at a time. I've piles of game screenshots (not just MTW) to get through and batch processing will save me a lot of time.