Dammit, stop bickering people
I solved my problem. The hard way, I installed XP, a trial version of Office 2007 and saved the file as a normal XLS file, then I could open it in OpenOffice.
Now, stop fighting
I Stepped On A Cornflake!!! Now I'm A Cereal Killer!
Btw, the file command does some good magic when it comes to excuatbles for example, it can see wether an excutable was stripped or whcih architecture it's from