Thank you both!!!  It's back to normal and I have saved your posts.

I think I really messed up.  I was looking at someone in my file and it looks like I accidentally added some letters to the name (3 A's written together). Thinking I could look back at one of my backups, I clicked on it and I got a list of files to use to open the backup. dumb, I know, but I clicked pdf. Now all backups show that icon, but still have the rmgb extension. So, I tried to backup my file to see if it would backup correctly. It also shows Adobe icon. How do I fix it, please???