lz file? what are they and how do i get the models?

[DrifterDx]

hi i need help with DS ripping, specifically with two games

Kaiju Buster and Kaiju Buster Powered

i can open the iso, but all i find are 'lz' files which i guess are the models
and/or textures. i can extract them but... what do i do?

how do i get the models?