Particle editor, Commentary node adder and material editor!

[youme]

You'll have to add them to the manifest file (portal/particles/particles_manifest.txt)
Extract the one from the game files using GCFscape then put it in that directory and add yours to the list.

[Hen7]

Did it, didn't worked, And I don't even have custom particles, the normal ones like fire and blood don't work.
(It's a ep2 mod, although I have the same problem in my portal mod)