"Highly compressed" doesn't just mean the file is zipped; it usually involves internal modification:
Here are some technical details regarding the highly compressed ISO version: Tekken 5 Highly Compressed Iso
Highly compressed files are prone to crashing or missing features. If the compression process removes a specific sound file the game engine expects to load, the software may hang. "Highly compressed" doesn't just mean the file is
To reach such small sizes, "ripped" versions often remove the high-quality CGI opening movies Tekken 5 Highly Compressed Iso
Then, he saw it. A forum post from 2009, glowing with the holy grail of emulation piracy: