Missing recently used file

A file that I was working on three days ago is no longer popping up in my recently opened files when opening Rhino. I can not find it anywhere else in my computer either. Please help

Hi Mary - I’m afraid there’s very little information here.
If you have saved a file multiple times and you haven’t changed the default of saving backup files, you might find a file with the 3dmbak extension in the location where you saved the file and you might find older backup files in the trash (“Recycle Bin”).