Which file host the spells code?

Well, you know about <race>AbilityFunc.txt files. It contains, for example :
// Bash
[AHbh]
Art=ReplaceableTextures\PassiveButtons\PASBTNBash.blp
Researchart=ReplaceableTextures\CommandButtons\BTNBash.blp
Buttonpos=2,2
Researchbuttonpos=2,0
Order=bash

I think Order is referring to some code, no? so where could I find the coding for bash? which file I may edit to create a Custom spell?

Thanks a ton for your help! :)

it's Abilitydata.slk