Does anyone here have experience with Game Extractor?

[ikskoks]

You can open those files in hex editor (e.g. Hex Workshop) and search for signatures.

For example:
RIFF --> WAV audio
OggS --> OGG audio
BM --> BMP image
89 50 4E 47 0D 0A 1A 0A --> PNG image


Btw, you can try ImageHeat for raw image preview https://github.com/bartlomiejduda/ImageHeat