Open the dowloaded File into Open Office

Instead of a Excel Spread Sheet, It looks like a word Doc

v1.0, PHP 5, WinXP (Apache/PHP server as well)

I believe there is a simple solution to this: Just replace the mimetype xls by xml (Filename: test.xml) and it should work in OpenOffice Calc. However, I'll still need to test this and I will provide a solution in the next version.

Version 1.2 will add the remote setting of the mimetype extension. Thus you can decide whether you'd like to export to OO or MS Excel. You may still open XML files with Excel using the "Open with..." dialog.

Yes, I had same problem... Very quick solution for MS a OO should be XLSX. It works in both. Set mimetype to *.xlsx