Based on the filename Dupe-Trigger-Mod-Fabric-1.20.1.jar, here are possible features for such a mod (presumably for Minecraft Fabric 1.20.1). Since the name suggests a duplication trigger, the mod would likely allow players to duplicate items under specific conditions.
Instant Duplication: By default, pressing the "=" (equals) key will double the item in your main hand.
Use a VM (VirtualBox) or a disposable Windows Sandbox without network access. File name- Dupe-Trigger-Mod-Fabric-1.20.1.jar
Dupe-Trigger-Mod-Fabric-1.20.1.jar is the Fabric loader version of the Dupe Trigger
Server Synchronization: Unlike some client-side glitches that create "ghost items" (items that look real but disappear when used), this mod attempts to synchronize with the server to ensure the duplicated items are persistent. Based on the filename Dupe-Trigger-Mod-Fabric-1
NBT Data Retention: The mod keeps all item data intact. This means enchanted tools, named items, or written books are copied exactly with all their properties.
At its core, Dupe Trigger is a "quality of life" or "utility" mod that adds a direct command to double whatever item is currently held in the player's main hand. Unlike complex in-game "dupe glitches" that require pistons, chests, or server-lag exploits, this mod provides a clean, software-based solution. Core Features and Functionality Step 5 – Run in an isolated environment
While the mod is highly effective for single-player worlds and LAN games, users should be aware of its limitations and risks: Dupe Trigger - Files - Minecraft Mods - CurseForge
Add Fabric API: Most Fabric mods also require the Fabric API to be placed in your mods folder.