The elvenrider.zip file you have requested: Modifications / Miscellaneous / Elven Rider - 255.51kb is not available. Perhaps try browsing all files for the game Civilization IV: Beyond the Sword and upload any files you want to share or are missing. This is the only information we could locate:
For more information on Civilization IV, visit Civilization4.filefront.com The Halberd is made by Mr. White, Rabbit. The Helm is a reskinned model from Morrowind. I think Bethesda don't like this so it will be my last model with morrowind mesh.