"This file has been blocked because it is potentially unsafe"

Si tried sending me some photos a couple of days ago via MSN and I started getting error messages like:

"[user] tried to send you a file (filename.mp3). This file has been blocked because it is potentially unsafe."

There’s a registry file available in a thread in the Mess.be forums, which disables much of the XP SP2 file security. Open it up and edit as appropriate before executing, and at your own risk.

Thanks to Catherine for helping me test this.