Here lies the contradiction. The phrase “extra quality” suggests that despite heavy compression, the game retains:
In reality, high compression and extra quality are opposing forces. Lossless compression can shrink a 4.37 GB ISO to roughly 2.5–3 GB (using 7-Zip Ultra settings). Anything smaller—say, 500 MB to 1 GB—almost always involves lossy compression that damages assets.
If you want actual "extra quality," skip the compression war. Download the official Dolphin Emulator, get a lossless WBFS of your game, and then: Here lies the contradiction
A 2.5GB lossless file will look infinitely better than a mangled 500MB "super compressed" ISO.
Before discussing compression, we must understand the source material. The Wii version of MW3 was developed by Treyarch (despite Infinity Ward’s involvement in other ports). Unlike the PlayStation 3 and Xbox 360 versions, the Wii edition featured: In reality, high compression and extra quality are
A standard, uncompressed ISO of MW3 for Wii is approximately 4.37 GB (the max capacity of a Wii disc). While not huge by modern standards, collectors who store hundreds of games often seek smaller sizes. Hence, the call for “highly compressed” versions.
This free tool can take a raw ISO and convert it to .wbfs format. WBFS (Wii Backup File System)
An ISO is a raw, bit-for-bit copy of the game disc. Emulators like Dolphin require either an ISO, WBFS (Wii Backup File System), or RVZ (highly compressed Dolphin format). A standard ISO is large but universally compatible.