What is QXM and Where can it be found

I’ve searched Google, Bing, Yahoo, For what QXM is and I’ve even searched the forums (both normal and the search Google options). The Normal gave no results (said could not find the word) and Google search only gave 2 threads that i could find no information on QXM. The reason i am trying to figure this out is it is the only thing I am missing from the requirements for this add-on: http://www.garrysmod.org/downloads/?a=view&id=46773 (Swordfish II from Cowboy Bebop) I’ve even tried downloading XQM thinking maybe either side made a typo and was unable to get it to work.
If anyone can tell my what QXM is and how to download it, I would most appreciate it.

tl;dr version:
What the heck is QXM i can’t find anything about it anywhere. D:

Thank you in advance :slight_smile:

no one knows?

Yes, install PHX3 and you get it.

It´s some airplanes and such.

Link to download http://www.facepunch.com/showthread.php?p=9647348