Lost File - CCleaner Says "Missing MUI Reference"

I have had a master file I have been working on for 2 years.
Yesterday I spent all day on one of the sub-files. Today I looked for the Master File and it had completely disappeared along with ALL of the sub-files (including the one I had been working on).
So I ran CCleaner and sure enough, there was my missing Master File C:\Users\etc etc with the Registry Problem identified with it as Missing MUI Reference. How do I get my file back. A normal search using file and sub-file addresses came up blank!
(I did not activate CCleaner "fix" yet)

All back! Thanks to Windows "Recover lost or deleted files" online help!

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