I don't know what you mean by repairing it in control panel. However, I may not be explaining the problem correctly.
I can open a Word document I've recently worked on if I am in Word and go to OPEN and the file is still listed in the 'history' of recent document files.
But, if I worked on the file a month or so ago, and it's no longer listed in the 'history' of recent document files, and I to go to the folder where I saved the file and click to open it I get a message:

X Windows cannot find 'C:\users\owner\desktop\beth's files\beths office files\dons letter.docx'. Make sure you typed the name correctly, and then try again.

It doesn't matter whether I've already got Word open or not. Also, when someone emails a Word file to me I get the same message.