Put them in a folder and forget they exist until the next time I actually decide to play CC.

i play them on Astro or Zombie Cave

First, i open up cc
Then, i click campaign.
After, i click magginot mission
Fourth, i try to beat it with the new mode soley
Fifth, if it can't after 5 tries i usually trash it. UNLESS it has a really cool efeect or something
Sixth, Forget it exists. Until i feel like having a skirmish.
When i do remeber, i sometimes pit them against the cyborg zombies and green ai. (three way battle since the zombies when they come out of the dead corpse are teamless. Also i like looking around the ini scripts, lua scripts and any other thing that might be interesting, like P3lBox's Matilda revolver.
Eighth, delete when something that will replace it.