I updated dbus-switchboard to version 1.2.1. It no longer requires manual editing as root for many of the file types (usually those not already associated are automatically supported now).

I added support for XLS and CSV (Gnumeric), and DOC (I wrote a script to use antiword to convert to pdf and then i launch osso-pdfviewer to display it.

Bittorrent, midi, comix, iso should also be supported with no editing.

If you have already installed Abiword on you default maemo filesystem, then there might be mime type you need to add like msword but i uninstalled abiword and rebooted and it went to switchboard using octec-stream (unknown). So it works 'easily' as doc viewer only if you don't have abiword installed on maemo (debian abiword wont interfere and you can actually add that as a handler for DOCs too)

So if you install gnumeric and antiword (i have link for an antiword build in 1st post although i know there are others around), then you can view DOC files and XLS files which you get on the web or on device. If you get them as email attachments, you may (or may not) have to save and then click on them in osso file manager.

Persons who already edited the defaults.list (on their current flash) may or may not need to add the mime types if they are already set.... but the 'active' mime types which i add now should be ok to have dups of.