|Are they doc files? If you can't see the file type then go to "Control Panel > Folder Options > View" and uncheck Hide extensions for known file types. |
What program do they normally open with (Word perhaps)?
You can right click any one of them and set it to open with whatever you like (hence the question) - all files of that type will then re-associate.
There are also fixes around but again we need to know what file type needs attention.
Always pop back and let us know the outcome - thanks