The game is quite old and is usually called with the following names:
- Disaster Report
- SOS Final Escape
- Zettai Zetsumei Toshi
I'm making this post because the interesting thing of this script is that it has been used recently for a work-in-progress localization of the game (that's why I made the script):http://www.assemblergames.com/forums/sh ... ix-project
From a technical point of view I think the format is interesting.
Basically in some archives you have the index table located on a file with the FAT extension and data in DAT, while in others it's all merged in a DAT file.
Anyway, it's a simple format without compression or encryption/obfuscation.