Microsoft has posted a fix for the RMS bug I had written about last week. Here are the links for the fix:

Cannot Open Office 2003 Documents Protected with RMS – Update

The issue of the inability to open Office 2003 documents protected with RMS has now been resolved with a hotfix.  You can obtain the hotfix by using the following locations.

Office Client – KB978551

Word Viewer – KB978558

Excel Viewer – KB978557

I hope this helps those who are having this issue.

Comment welcome.

Direct source to fixes is here