>I'd like the ability to validate an NT password within my application so I won't have to maintain a separate user login file. I'm sure this is possible, I just don't know how. Any help would be appreciated.

What do you mean with validate a password ? Dou you want to use the login name of the user for your application or to get the password ? The password hashes are stored in a SAM file. You can't decrypt them, you have to use the same hash computing algorithm to compute the hash from the password and then compare the result with that stored in the sam file.