To understand this specific file, it helps to break down the technical name:
is one of the three or four specific base files requested by the d2x installer for an offline installation. Ios38-64-v4123.wad
The Wii operating system does not have a single monolithic kernel. Instead, it uses dozens of different modular operating systems called "IOS" branches. Different games and channels require different IOS versions to run. To understand this specific file, it helps to
This denotes the 64-bit architecture identifier used in the Wii's internal Title ID naming conventions. To understand this specific file
NUSGet is the modern, preferred application for grabbing clean system files.