The missions_impossible_310709_1740.zip file you have requested: Maps Levels Missions / Coop Maps / Left 4 Dead Cooperative Map Missions Impossible - 7.45mb is not available. Perhaps try browsing all files for the game Left 4 Dead and upload any files you want to share or are missing. This is the only information we could locate:
NOT INTENDED FOR SERIOUS PLAY. THERE ARE MANY BUGS THAT CURSE THIS GAME. This map was uploaded mainly for my friends on steam. It is a very early representation of a map that should be completed by Fall 09.