It sounds to me like you have something (not an excel workbook) in your XLStart
folder.

It could also be in the folder that's specified under:
Tools|options|General tab:
"at startup, open all files in:" <xl2002+ wording
"Alternate Startup File location" <before xl2002 wording

Chip Pearson has some notes that you may want to read:
http://www.cpearson.com/excel/StartupErrors.htm


jbaldwin1984 wrote:

We opened an Excel 2002 file emailed to us in our Excel 2000 program. Ever
since then, we get an "error (9.0.6926SP-3) File Format is not Valid"
message, but allows the workbook to be opened anyway.
Even now when we open a blank (New) workbook file, the same error message
appears, but allows the program to proceed.

How do you get rid of this error nuisance?

James

--

Dave Peterson