What is a gcz file and how do I open a gcz file?
A GCZ file is a Nintendo GameCube or Nintendo Wii game file saved as a compressed disk image. It contains a copy of the data from a game disk, compressed to save disk space, and is similar to a GCM file. It can be created and opened with the Dolphin emulator.
Relevant gcz file links:How to open gcz file on Youtube
How to open gcz file on Wikipedia
How to open gcz file on Microsoft.com