Folks:
The last time I used OpenSuse was about 6 months ago, and at the time OpenSuse’s version of OpenOffice supported the Microsoft Office 2007 file formats; however, I just downloaded the newest installer, and I noticed that file extentions like “.docx” are no longer offered.
I don’t recall it ever being offered as an option because you cannot save to docx but I have just clicked on a docx document and 3.1.1 opened it immediately.
Which version of OpenOffice are you using? I’m using from the OpenOffice STABLE repository (version 3.1.1.1-1.1) and I have the option to save as .docx and open .docx as well.