With this file and a legitimate online CD Key (obtained elsewhere) you can play online without the original CD or worrying about Punkbuster accusing you of hacking due to the use of a NO-DVD crack.
* Install the game - Full Installation.
* Mount the QUAKE4MINI-SKL.MDS DVD-Image in DAEMON Tools v3.47 (with renamed device drivers).
* Use an anti-blacklisting tool, like SafeDisc 4 Hider, to avoid SafeDisc v4.60 blacklisting of Alcohol 120%.
* Play the Game!