Thanks! I will try the ilfilosofo plugin soon.
I just detected a way of quickly adding OpenOffice support:
'doc' => 'application/msword',
'odt' => 'application/vnd.oasis.opendocument.text',
After this one line odt addition, WordPress accepts OpenOffice documents. The only problem is that even if I use "page restriction" plugin, the uploaded file remains publicly available in the uploads folder. There is a "safe files" plugin to solve this little security flaw, though. Next I'll try it - and then the IlFilosofo.
This seems to work out. Wonderfull!