About This File
"ModIt is a modified ModelViewer which allows you to edit various parts of the Model"
Original post : https://www.ownedcore.com/forums/world-of-warcraft/world-of-warcraft-model-editing/wow-me-tools-guides/275579-development-modit.html?s=ad7d386d9b5a5fb34316b3c2ec121689 (links are dead)
Note : I haven't really tested it and I doubt it works well for editing, but it is very useful to display model attachements and bones over a classic model viewer.