Windows 6.5 Lock Password - Registry Location?

[BPFerrari1]

I was wondering if anyone knew where location in the registry is for the windows 4-digit password you set for the lock screen. Reason I ask is that I wanted to change the settings from 4-digit to 1-digit lock code. I like how the 6.5 Lock Screen works with the password, but I think just having a single digit like a '0' would make it a lot easier/quicker to use.

Thanks.