ASCOM driver for ST4 port

[davenash]

In the old Artemis CCD Yahoo group there is a message indicating that there is an ASCOM driver for using the ST4 guideport on the camera (in my case an Atik 16HR) when guiding via another camera:
http://tech.groups.yahoo.com/group/ArtemisCCD/message/2468

Unfortunately this group is now closed and only members can get access to the files, so I can't get that file.
Does anyone know of a source of the driver or another solution to allow me to guide via one camera whilst using the ST4 port on my Atik camera to guide?
FWIW I use PHD for guiding with a Meade DSI Pro as a guide camera.

Thanks
Dave