I tried to open a file on my recently opened list in Excel. I got a message saying the file couldn't be found. I didn't move it and I didn't delete it. It was not in my trash folder. I used Spotlight to locate it by searching on the file name and had no luck. I did recently install Yosemite and, aside from the fact that my computer is significantly slower now, I remember some glitches following the installation of Yosemite. My user crashed or something and I had to log out and back in. I have tried two different deleted-file recovery programs to locate it, and I still had no luck. Can a file be accidentally obliterated so easily and leave no recoverable trail of itself?

I know Excel is supposed to save backups of files you're working on every ten minutes. Does anyone know where those files are located? Perhaps I can find it there. I would really like to get back the info that was in that file. I created the spreadsheet on a secondary computer to which no external backup disk is attached, so it appears that hope is fading fast.
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