The bnpk_uo_background.zip file you have requested: Skins / Miscellaneous / Call of Duty BNPK's UO Main Menu - 895.09kb is not available. Perhaps try browsing all files for the game Call of Duty: United Offensive and upload any files you want to share or are missing. This is the only information we could locate:
Here's BNPK's menu screen for UO! It looks great.