Make sure you are saving the file on the same version of excel you are using.
Try doing a SAVEAS to a new filename and the re-opening the new file.

You may want to search for "corrupted" at this site to see other solutions.
the last time I ran into this problem was in a posting a couple of weeks ago
Can't find the posting. But a person was sending files to multiple coutries
and depending on which county saved the file and which one opened the file
the same error message came up.

"JLMHoss" wrote:

I created a large multi-sheet workbook with lots of Vba macro stuff.

This worksheet has been working fine until lately. Just recently after some
minor revisions I saved the file as I always have. The file will open fine,
but as soon as make even a minor edit and save the file, the next time I go
to open the file I get the following error message:
"Excel found unreadable content in "*****.xls" Do you want to recover the
contents of this workbook?"

If I answer "yes" and open the file all of the formatting and background Vba
code is gone.

Any suggestions how I can test the worksheet for unreadable content prior to
saving?


--
Thanks for your help

JLMHoss :)