A really hacky broken ass partially working NRBF viewer born from trying to pry Trombone Champ files open.
This was tested with:
TromboneChamp\TromboneChamp_Data\StreamingAssets\leveldata\songdata.tchampTromboneChamp\TromboneChamp_Data\StreamingAssets\leveldata\*.tmb- Recent Clone Hero PTB song caches (I don't know where they are, I don't play anymore)
This was prototyped in one single plain JS file in about a dead workday or so uh, here be dragons.
The implementation is wildly incomplete, so your mileage may vary outside of the aforementioned use cases.