I have a server running Windows 2008 R2. All clients are running Windows 7 with Office 2007 or Office 2010. All of a sudden, yesterday, the Excel files in a server shared folder have become corrupt. No other file type is corrupt in that folder or sub-folders. No Excel files in any other directory are corrupt. Just this one. When you try to open the file it says "The file you are trying to open, , is in a different format than specified by the file extension". If you say ok then it just shows a lot of garbage in the spreadsheet.
Quota management is off and VSS is not enabled.
Has anyone come across this issue before?