See whether what Stephen Lebans has at http://www.lebans.com/oletodisk.htm 
is what you're looking for.

Incidentally, if you feel you need to post to more than one group (HINT:
it's seldom necessary), please have the courtesy to cross-post (send the one
message to all groups at once), rather than multi-post (send individual
messages to each group). In this way, all responses to your post will be
available together, regardless of what group the responder was in, and the
rest of us won't have to read your post multiple times. (It also uses fewer
server resources)

I see you're using Outlook Express. Click the "Newsgroups:" label to the
left of the box containing the name of the current newsgroup. That will open
a dialog that will let you add additional newsgroups to your post.

Note that it's generally consider to be A Bad Thing to cross-post to more
than about 2 or 3 newsgroups.