Open xlsx in Office 2003

[Phuoc Do]

Hello,

I have an VSTO add-in that attaches to the Open event. I install the Office
2007 Compatibility Pack for Office 2003, then try to open an xlsx file. In
the Open event handler, I get a workbook passed in but with unexpected
parameters. The filename is of the form "CVT5CB.tmp" and the location is the
Temp folder. Any suggestion to fix this problem?

Thanks,
Phuoc