This is a useful convention from the N64 homebrew community that ROM hacks (like the DK64 Randomizer community for example) use to add information helpful for identifying the game. This is useful for ROM hacks of N64 titles which need to use the plugin hacks and other mini hacks to operate correctly.
Currently an example of this not working is the DK64 Randomizer generated files not being able to save, despite vanilla DK64 saves working just fine.
This is a useful convention from the N64 homebrew community that ROM hacks (like the DK64 Randomizer community for example) use to add information helpful for identifying the game. This is useful for ROM hacks of N64 titles which need to use the plugin hacks and other mini hacks to operate correctly.
Currently an example of this not working is the DK64 Randomizer generated files not being able to save, despite vanilla DK64 saves working just fine.
More info here: https://n64brew.dev/wiki/ROM_Header#Advanced_Homebrew_ROM_Header