In the world of torrenting, "Extra Quality" was often used as a marketing tag by uploaders. It signaled that the video had been encoded using advanced (for the time) codecs like , ensuring that despite the 450MB size, the "blockiness" and artifacts were kept to a minimum.
In 2005, the landscape of the internet was vastly different. High-speed fiber wasn't the standard, and streaming services like Netflix were still years away from global dominance. For many, the only way to build a movie library was through peer-to-peer (P2P) sharing.
Standard CDs held 700MB. A 450MB file allowed users to fit the movie plus extra features, or perhaps two shorter films, onto a single disc.