I made custon loot tables, but after i opened them with notepad they stopped working. I've already tried to attach .json at the end of the file agian, but it still doesn't work.

can i have some help pls. I am on windows 10 and used minecraft version 1.12.

Edit:I just deleted my old file and made a new loot table but that one also doesn't work. when i place it in here it sais it has double .json but when i place it in my folder it doesn't have .json at the end.