Custom entity in hammer

[Mister.K]

So I`ve got someone I won`t tell who but shared a mod which has npcs and weapons he made for me to use in my mod and I`m thinking how to implement mod`s custom npcs and weapons in retail hammer(Get the entity into hammer without making it obselete entity)
(mod is for source sdk 2013 upcoming)

[VXP]

You need to edit an existing .fgd file from bin folder of Half-Life 2, or make one by yourself and add it to the Hammer's options

[Mister.K]

You need to edit an existing .fgd file from bin folder of Half-Life 2, or make one by yourself and add it to the Hammer's options

It sounds like some difficult thing to do.
It's not possible for some random high school student is it?

[CremationWorks]

So I`ve got someone I won`t tell who but shared a mod which has npcs and weapons he made for me to use in my mod and I`m thinking how to implement mod`s custom npcs and weapons in retail hammer(Get the entity into hammer without making it obselete entity)
(mod is for source sdk 2013 upcoming)

Try opening the .fgd with this. Also, I wouldn't think it's that difficult.

https://notepad-plus-plus.org/