DO/Modding/Tools/WH2EDIT
From Dark Omen Wiki
WH2EDIT (short for "Warhammer 2 Editor") is a DOS based utility written by Mikademus 1998 in Borland Pascal for editing the .ARM (army) files of Warhammer: Dark Omen. It allows editing virtually every aspect of the army files, but the version circulating today is an unfinished beta and somewhat buggy.
The source code is available for download and use licenced under GPLv3.
Darkmancer has stated he will make a modern version of WH2EDIT.