This article is about Gotcha Force ARZ file format and ongoing researchs on it.
Format
All arz files are valid HSD models compressed with the same algorithm than .pzz files. To decompress arz we use pzztool with -di arg:
pzztool.py -d -di file.arz
Then we have to remove the last Null byte 0x00 added during decompress. For more information about implementations of HSD models see the implementations page.