Can't get my particle system to work.

Alright I'm editing some of the "unusual" particles, just to mess around.
I've finished one, have the file saved in the particles folder but I cannot get it to work.
It says the particle doesn't exist.

Couldn't find any particle tutorials so spare me.

What do I do next?


edit: here's some more info


The particle ".pcf" file is called flies_fixed.
The particle system in the file is called "superrare_flies_fixed".

I have a particle system entity initiated in my map to spawn "superrare_flies_fixed" but I get the error message

Attempting to create unknown particle system 'superrare_flies_fixed'

I did that, but it seems putting the manifest file in the particles folder isn't enough, it's using the built in file instead.
edit: Actually, oops, forgot to add .pcf to the end of the file name.