Recover Password

I’ve recently upgraded my wordpress version to 3.1. One of my users has forgotten their password. My objective at the minute is to recover the password, not to reset it.

Basically, what I want is to know how to retrieve the password from the database. All the websites with tutorials talk about it being an MD5 hash. However, the passwords for all of my users start with $P$B (in phpMyAdmin of course) which is clearly not part of an MD5 hash. Also, some of them have a / in them, which again is not an MD5 character.

So I’ve tried putting the password ‘keys’ into many different MD5 decrypters and none of them work with these. Suggestions please?