Notes about the GMLWB file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The GMLWB file type is primarily associated with 'Garry's Mod Lua Weapons Builder' by Happymax. This is a Project file for Gmod Lua Weapon Builder. This program generates LUA scripts for
use with Gmod 9.0 or higher.