XP Pro; Office 2003

I'm not sure this is the correct place for this post, but since it's only
happening to my Excel workbooks I thought I'd statr here..


When I open Excel workbooks and then close them without making changes and
without saving (in fact I do not even get the prompt to save), the system
last date modified changes to the current date/time.

The autosave option in the Tools- Options menu is unchecked.

What else might cause this to happen and how can I prevent it? As best I can
tell this is only happening on my Excel workbooks.