What?
Anyway, enough laughter.
You don't compile nod file, they are automatically created when you run your map for the first time. Nod and nrp file are created by the game and store information between different air and normal nodes, which are used by monsters to navigate through a level, like a human grunt running away from the fight to reload his weapon.
Place some nodes close to pillars or something (info_node) and some human grunts and see what happends when they run out of ammo and need to reload.
Nod and nrp files are placed in the mapsgraphs folder.
Of course, nodes are only usefull in singleplayer maps.