Mystery image files only open in windows photo viewer

soloalpinist

Distinguished
Nov 21, 2012
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I'm running Windows 7 64bit. I have a number of images files (that should be jpg) being shown as .AT, .ED and a variety of other strange file types. I can view them in Windows Photo Viewer but I need to convert them to jpg.
These photos are on old Iomega Zip Disks. I bought a USB Iomega Zip drive specially to access these photos.
Is there a way I can convert these various files to jpg?
Sorry if this is the wrong forum .... wasn't sure where to post.
All help is appreciated...