N64 ROM file index hacking issue

Alright, I downloaded the N64 SDK and compiled one of the samples provided by the SDK and dissembled the ROM with IDA and found the asset data is stored some way using index’s so my question is.
What are file index’s?
Is this where the game data is stored in memory through these indexes?

What I have already tried:

I got all the memory address’s and op codes where these index’s are.
Would like to hear your all’s theories behind this?