

On a Microsoft support page which (like most of them nowadays) no longer exists - but is cached by Bing - I found the following article: You receive an error when trying to open a. When I go to Event Viewer, I see the following in Application Log every time I try opening an Office 2007 file: On a computer with a newer version of Office, if I Save As the older three letter extension format and then try opening in Office 2003, it works perfectly. I tried a dozen files and they all have the issue. However, when I try opening any of the newer file formats, I get this error message:

I do see an option to save as "Office 2007 file" in each of the programs, so the pack definitely installed. I even installed up through Service Pack 3. I installed the Office Compatibility Pack for Office 2003 so that I would be able to open, edit, and save newer Office files.
