Quote Originally Posted by fletcher77 View Post
Just make sure the folder is the same name as your ass file. IN RED

c:\program files\microsoft games\halo 2 map editor\data\scenarios\multi\vel\structure\vel.ass
The parts you highlighted in red have absolutely no relation to each other, I regularly call my .ass files "bsp" while in "multi\mylvl\structure".

It may be worthwhile deleting your .scenario, .ass, and any other files related to your level and re exporting from scratch.