Now, Microsoft has admitted they made a mistake. The workaround they posted was too complicated, and they have stated the information they provided was in fact wrong. Rather than the files themselves being a security risk, it seems the way Office 2003 parses the documents is actually where the security risk comes into play – go figure.
Microsoft claims they posted the complicated registry workaround only because they thought only a few people would need it – so much for supporting the little guy. Either way, they claim it was a mistake – and addressed it. Now there are downloadable updates which unblock older files, without having to root around in the registry.