Well, after thinking about everything the two of you wrote, I thought if I did have some file to unlock the encrypted file it would be in my HELP directory (my own little directory I put licenses, keys, and everything else I think is important in).
I did find a file that asked for my password when I opened it. I only have one password for very important stuff. I typed it in and away I went.
The folder is now unlocked. I guess I was using the EFS encryption?
Anyway, thanks for all of your comments! They jarred my memory and made me look for a key.
Please keep helping us poor unfortunates who try something once and forget completely about it.