you DONT need to add the pcf as extension.
to use precomp correctly.. extract the files from the Precomp.7z into its own folder
make a text file input this into it
Code:
precomp038 -slow -c689 -m68 -opak000.sdpk2 "e:\program files\Brink\base\pak000.sdpk2"
rename the filename.txt to filename.bat ( edit it and CHANGE the path to match where your game is installed ) my path is e:\ ....
It worked perfectly, never had to delete anything.. it created the Brink.arc ( 2.33GB ) DVD5 size is 4.25GB.