Today I cannot open any files marked as .xls or .doc (97-2003 Versions) within Office 2010. This has only just happened and everything has been working fine up until now.
When I try and open a file the message
"The file you are trying to open........., is in a different format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening the file. Do you want to open the file now".
If I select yes I get rubbish displayed.
As I say this has been working fine. Also I have scanned the server and the PC with Malwarebytes and nothing detected.
If I restore the files from yesterday I can open them with no problem. I can also open all files created in the new version.
This is a shared network drive and doing a blanket restore will be a real problem. Why would thay have become corrupted and can I get around it without restoring the entire drive?
If the file cannot be opened by any other computer than the file is likely to be corrupt, and you might have to restore them from the backup, or use a number of office recovery tools out there, although most require you to purchase them, and they're not 100% foolproof in recovering data. You can google "recover corrupt office file" for many such hits.
Scanning for viruses is nice, but is not 100% at detecting everything on your system. Best to always test with a known clean system.