I've been modding the Q3 engine for quite a while now and have lots of experience with the types of files it uses (directly accessible sound and texture files, .map, .pk3 paks), but so far I've been unable to find one specific file type: .efx.
Does Nexuiz use the .efx file format for its effects? If it does, can I access and edit them (using the program EffectsEd)?