Email shortcut icon

I'm using Thunderbird as my email client and I used to have a desktop icon I could click to open the send mail window with a pre-addressed mail. I created a desktop shortcut and put something like this in the location window:

mailto:addressee@email.com?subject=Some Topic

This doesn't seem to work in Windows 7 64 bit and instead of a shortcut icon I get a small desktop file created. When I click it, a send mail window opens but it isn't pre-addressed and the desktop file is an attachment.

Can anyone explain how to achieve the required functionality?

Er...I appear to have solved my own problem. The trick was to create a shortcut to the Thunderbird .exe file and add the necessary command line arguments to the path. Syntax at:
Command line arguments - Thunderbird - MozillaZine Knowledge Base