Hi Doug,
You may already be familiar with the program, Irfanview. That's the photo viewer that I use.
It's free, fast and opens many different file formats. You can expand its capabilities even further by downloading the corresponding plugin.
One thoughtful feature; During the install, if you choose to have Irfanview be the default program for everything that it can open, it asks "Really?", giving you another chance to reconsider your choices.
See
www.irfanview.com.
In downloading the program, read carefully before clicking. Numerous sites offer Irfanview. Some of them try to entice/trick you into downloading additional software by tempting you with large buttons that don't link to the Irfanview download.
Ralph Sutter