Helmet and alternate team textures for the Plague Champion
Place the .sga Archive file on your \Valve\Steam\steamapps\common\dawn of war 2\GameAssets\Archives
Open your DOW2.module file with a text editor such as notepad of workpad
Locate the are on the .module file that reads:
[data:common]
folder.01 = GameAssets\Data
archive.01 = GameAssets\Archives\230_data.sga
Add the file between Folder.01 and archive.01 like this:
[data:common]
folder.01 = GameAssets\Data
archive.01 = GameAssets\Archives\PCHelmet.sga
archive.02 = GameAssets\Archives\230_data.sga
And edit the number of the subsequent archives so that no number repeats, like this:
[data:common]
folder.01 = GameAssets\Data
archive.01 = GameAssets\Archives\PCHelmet.sga
archive.02 = GameAssets\Archives\230_data.sga
archive.03 = GameAssets\Archives\220_data.sga
archive.04 = GameAssets\Archives\210_data.sga
archive.05 = GameAssets\Archives\200_data.sga
archive.06 = GameAssets\Archives\GameArt_DELTA.sga
archive.07 = GameAssets\Archives\GameArt.sga
archive.08 = GameAssets\Archives\GameArtEnvironment_DELTA.sga
archive.09 = GameAssets\Archives\GameArtEnvironment.sga
archive.10 = GameAssets\Archives\GameArtEnvironmentTextures_DELTA.sga
archive.11 = GameAssets\Archives\GameArtEnvironmentTextures.sga
archive.12 = GameAssets\Archives\GameMaps_DELTA.sga
archive.13 = GameAssets\Archives\GameMaps.sga
archive.14 = GameAssets\Archives\GameDefault_DELTA.sga
archive.15 = GameAssets\Archives\GameDefault.sga
Note that every patch released by Relic will reset the module file and can even add new lines so don't just copy paste this.