I too looked for info about this folder, and what it contains. In my search I found this webpage with at least some information: http://weblogs.asp.net/israelio/archive/2005/03/14/394513.aspx
Dont know if it help you. But Hey... It cant hurt you.
This folder applies to Windows XP SP2 and similar applications. It has to do with Windows certificates. If you have a %SystemDrive% folder on your desktop, you should see the same (internal folders) in your User account. Look in C:\Documents and Settings\Your User Name\Application Data\Microsoft\.
See the following MS article for further information... hope this helps.