Not having a WM or Android device around, and wanting to create a gold card for my Mozart, I managed to put together a bit of software using some resources from the web and made an application that appears to do just this.
You basically just insert your SD card into the laptop card reader, run the app as admin, and click Read CID.
Note: IT MUST BE A LAPTOP CARD READER THAT IS NOT VIA A USB ROOT DEVICE - USB CARD READERS ARE NO GOOD
Well, at this stage just give it a go on as many laptops as you can find until it works, and post back what did and didn't work for you.
It seems about a 40% chance it will work, so try on a couple if it doesnt at first.
It will return it pre-reversed and ready for the Gold Card website - and the number works.
I have already successfully created a gold card using the number provided by the tool!
Download from here: http://rapidshare.com/files/45227527...CardHelper.exe