Gunvolt Chronicles Luminous Avenger iX (PC)

[Mysticus]

Is there a tool or script for .irarc and .bigrp files?

[aluigi]

Both contain graphics stuff in my opinion.
bigrp is a sequence of zlib compressed data, there is some header and info at the beginning but it's easier if you use offzip.
irarc is more complicated

[Mysticus]

So it's still not possible to extract, right?

[aluigi]

Only offzip on bigrp but no idea about the content and meaning.