Export to Excel

[Poni]

Hello,

From PWA (Project Server 2007). My task view. I'm trying to export data to
excel.
I'm getting the following message:
The file you are trying to open, 'My_Tasks.xls', is in a different format
than specified by the file extension. Verify that the file is not corrupted
and is from a trusted source before opening the file. Do you want to open
the file now ?
I pressed "YES" and another message: "Problems came up in the following
areas during load". and I'm getting the name "Table".
BTW, I have Excel 2007.

Please advice.

Thanks

P.