Wow, I just realized that Windows somehow thinks that this is an archive- weird.

Hm, on my Linux system everything is ok.
The windows computer I'm working on right now doesn't open .ods files (Why the h*** couldn't MS office support totaly open, well documented document formats?).

You might get lucky if you rename the file to "*.ods" and then open it with open office (or MS excell with plugin if something like this exists....)