Export to Excel fails on Windows 2000

[JB]

Hi All,

We have an ASP .Net application that has export to Excel functionality.
We are using contenttype="application/vnd.ms-excel". The functionality
works fine on Windows XP on the customer's machine but fails for
Windows 2000 SP4, IE 6.02 SP1 and Office 2000. It shows the "missing
file..." dialog box with the name of the aspx file as the missing file.
No other XL document is open at this time.

However, the development environment here is also Windows 2000, IE 6.02
and we are able to use the functionality successfully here. What could
be the problem - any IE settings or firewall issues?

Please help.

Thanks,
JB