The onthefly.zip file you have requested: Maps Levels Missions / Multiplayer / 2 Player / O to P Titles / On The Fly - 1.64mb is not available. Perhaps try browsing all files for the game C&C3: Tiberium Wars and upload any files you want to share or are missing. This is the only information we could locate:
A 2-player multi-player map for CnC3 from Crimey. It has excellent sound-effect placement and terrain variety.