Ripping from High Voltage Software games?

[SpongeBat1]

I want to rip the models from the Billy and Mandy game (so I can post them on VG Resource/check for any unused content to put on TCRF) but I can't find where the models are actually stored in the game's files. There's a file called "graphics.jam" but JAM files refer to programming and Noesis can't read them. Kids Next Door Operation VIDEOGAME uses a similar file format, and I assume other games by High Voltage do as well.

Does anyone more well-versed in ripping games know what file format they might use?