except instead of the file it tells you to extract from, find the GameAssets\Archives\000_data.sga file inside your Retribution installation folder and extract the defaultchaptercolours.lua from there, and then paste the finished .sga file into your GameAssets\Mods folder. That should work.
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WiseWindu
http://www.dawnofwar.info/forum/viewtopic.php?f=12&t=1748
except instead of the file it tells you to extract from, find the GameAssets\Archives\000_data.sga file inside your Retribution installation folder and extract the defaultchaptercolours.lua from there, and then paste the finished .sga file into your GameAssets\Mods folder. That should work.