This compressed file has all the game content extracted with the command prompt line polarissector.exe -extract all. It was thought specially for modders with the Steam game which it does extract the files and for other people because probably you save time extracting files.
Only for modders with the Steam game as you, I have added thic pack content.
Just unzip it. Next I recomend you to create a mod folder inside the game and to add the line in the REMEMBER.CFG from ..\Documents\My Games\Polaris Sector\
After the first line
Locale "Eng"
CurrentModPath "Your_mod_folder_name/"
Inside the folder, you can add only your edited files. Very easy and simple.