How can I edit an existing mod?

I want to translate an existing mod to my language. It has many many texts and sound files in it, the sound files I will just record the new ones in portuguese and replace the existing ones, the texts I will translate direct from the files. I think It would be greatly useful for a couple friends.

Anyways, anyone knows how I could do this? Is there any programs I could use? I only know about Advanced Genie Editor, but coulnd find a way to open already existing mods in it.

hi easiest way to start in your case is: Copy the mod from your subscribed-folder into local-folder.
the path should look like this C:\Users\Yourname\Games\Age of Empires 2 DE\longnumbersteamid\mods.
Then you can import your local mod and change every file whenever you have time.