Questions Regarding the Definition of Weapon and Equipment Appearances and Textures

[wish]

I have some new questions. The Item file contains the image numbers and model numbers of items in the inventory, while the Resource file stores the MSH files corresponding to the model numbers. When opening an MSH file with HXD (a hex editor), each file contains the name of the corresponding DDS texture file. However, for some visible items (e.g., iwlua45), their corresponding MSH files (e.g., ACCRETIA_WEAPON_TLAUNCHER_088.MSH) cannot be found in the specified directory (.\ITEM\WEAPON\MESH). How are these items still displayed correctly?