"Go into your file manager options, find the checkbox that says (something like) "Hide extensions for known file types" and disable that. Note that I'm drinking my Sunday morning coffee and typing on my Mac and do not feel like running downstairs to look up the exact phrase on my Windows machine, so I may have that label slightly wrong."

The option to see extensions is under "Folder Options" and should be at the top of every window. If not, it will be under Control Panel/Appearance and Personalization/Folder Options/Show hidden files and folders. Uncheck the box that says "Hide extensions for known file types" It's one of the first things I do when I get a new computer or reinstall Windows. Microsoft thinks I don't need to see these things, but I absolutely do..LOL.

Laurie