How to set libreoffice to save as .doc by default?

[john]

Hi all,

I am trying to set .doc to be the default file format for all
libreoffice users on Ubuntu LTSP 10.04
Under openoffice I used to be able to do this by editing:

/usr/lib/openoffice/basis3.1/share/registry/modules/org/openoffice/Setup/Setup-writer.xcu

That file doesn't seem to exist for Libreoffice. Does anyone know how
to do this under libreoffice?

Thanks!

John