The user program (OB1)
The data block (DB1) and
All configuration information (SDB).
Not totally sure if it wipes the password but it's certainly worth reading up on. It does sound like you would need a back-up copy of the program though.
Yes it cleans out everything, I have used it a few times... that said, if you need the program that is in the CPU you need the password not this exe, but I do wish other manufactures would make the same thing... Automation Direct ... but not naming names