Thanks for that, stfas. I thought it involved "tgd" in the filename compared to the original, but I couldn't remember where. I think the SS FC might have a slightly different file name again (Hangar-8 released another hotfix when SS was released and IIRC he had about eight potential textures for the FC!)
[edit] I've just checked and it looks like DC needs "_tgd" and Soulstorm needs the same plus a "2" later on.
Dawn of War used "force_commander_unit_default.wtp".
Dark Crusade introduced "force_commander_tgd_unit_default.wtp" and an additional "force_commander_tgd_war_gear_default.wtp" for the new wargear.
Soulstorm then added "force_commander_tgd_unit2_default.wtp" and a matching "force_commander_tgd_unit2_default.wtp".
There's also a "force_commander_default.wtp" in Dark Crusade and Soulstorm, but I don't know where that's used, and there's a "force_commander_unit_war_gear.wtp" that would imply it is a DoW one (because it doesn't have "tgd" in it) but DoW never used wargear.
And that's why Hangar-8 ended up confused and with so many textures