What is a GM file?
A .GM file can belong to several different formats. The most common use is a CNC machine G-code file created by SheetCAM. Another major use is an add-on file for Garry's Mod, a popular sandbox game. It can also act as a 3D game model file for the Akella STORM Engine, a General MIDI sound bank, a Gerber PCB mechanical layer from Altium Designer, or code written in GameMonkey Script.
Because .GM has multiple possible meanings, it is important to identify the specific format of your file before you use it. viewer.online/gm analyzes .GM files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
How to open GM files?
The software you need depends on the file type. You can open G-code files using SheetCAM or a basic text editor. You load Garry's Mod addons directly through the Steam Workshop. If the file contains GameMonkey Script, you can edit it with Visual Studio Code or Notepad++.
Best practices and troubleshooting
If you do not know what kind of .GM file you have, do not guess the software. Trying to open a 3D game model file in a text editor will display corrupted text. Instead, identify the file first. Once you know the format, you can convert it if necessary. We recommend using convert.guru to convert visual or audio .GM files to standard target formats like .JPG, .PNG, or .MP3.
Summary
viewer.online/gm directly opens and previews .GM files in the browser, eliminating the need to install software or troubleshoot compatibility issues.