Here's a pretty good knowledgebase:

INFO: Registry Entries Made by an ActiveX Component

But checked quickly, think this office stuff breaks the rules a little bit - not totally sure.

Btw - one of the KB references is to Dale Rogerson's "Inside COM" book ... he's the MS COM guru and this is (debatably) the "COM Bible", kinda like the K&R of COM.

-Shawn