The war of genesis 2 installation process and weird things

The war of genesis2 installation process

1. dosinst.arj from the disc is extracted.
2. genesis2/*.fli from the disc are copied.

Weird things
You can find patch_cd.bat in the installation directory. It is a tool that copies all files from the disc to the installation directory. Someone needs to run it after the installation because of disc read error.
But there is a weird file. It is scenario/sky04.map. The dosinst.arj has it. The disc also has it. And the patch 1.2 has it too. All of three are same size. But only sky04.map of the disc differs from others.