Unlike traditional mods that might alter graphics or sound files (which are generally safe and encouraged in PC gaming), a "mod menu" in Ghost Recon Wildlands usually refers to a piece of software often labeled as a "trainer" or "injector."
You have finished the campaign legitimately and want to mess around with vehicle spawns, fly helicopters faster, or test the map's boundaries without grinding Tier 1 mode.
For the uninitiated, a "mod menu" in the context of shooter games is essentially a user interface that allows you to toggle cheats and modifications on and off in real-time. Unlike traditional mods that might add new textures or weapons, a mod menu usually alters the game’s code to give the player unfair advantages or creative control.
I'm assuming you're looking for information on a mod menu for Tom Clancy's Ghost Recon: Wildlands. Before I provide any guidance, I want to emphasize that using mod menus or any form of cheating in games can potentially harm your gaming experience and violate the terms of service of the game.
The vast majority of executables ( .exe files) or scripts disguised as "mod menus" for Wildlands are actually trojans, infostealers, or crypto-miners.