SAMBA passwd-style files
    SAMBA is a free implementation of CIFS/SMB. The password 
    encryption on Unix and Windows is different, therefore SAMBA must have 
    his own file where the passwords are encrypted either as NT-Hash and/or as 
    LAN-Manager-Hash. LAN-Manager-Hashes are weak and shouldn't be used anymore, 
    NT-Hashes are based on MD4, but no salt is used, therefore users with the 
    same passwords have the same NT-Hash.
    In this file are also stored machine accounts, if the SAMBA server acts as 
    PDC, such entries ends with $.