MilkShape 3D .ms3d
MilkShape’s binary format. Half-Life and Quake modding.
What an .ms3d file holds
MS3D is the native format of MilkShape 3D, a cheap and deliberately narrow modeller that dominated game modding around the turn of the century. It stores meshes, materials, a bone hierarchy and keyframe animation in a compact binary layout, and it was the usual staging format for getting custom models into Half-Life, Quake and their descendants.
Commonly seen in: MilkShape 3D, Half-Life modding, Quake modding.
| Data | Stored in MS3D |
|---|---|
| Geometry | Yes |
| Materials and colour | Yes |
| Texture maps | Yes |
| Animation and rigs | Yes |
| Scene hierarchy | Yes |
| Read here | Yes |
| Written here | No |
Tested against a real file
The last sweep loaded jeep1.ms3d from Assimp test models with its 2 sidecar files through the viewer on this site: 2,032 triangles across 7 meshes and 1 materials, in 2.2 seconds. Every format's result is on the test results page, run 2026-09-08.
Convert MS3D to another format
Every pairing has a page saying what survives the trip.
Other things to do with an .ms3d file
Questions about MS3D
How do I open an .ms3d file?
Drop it into the viewer on this site and it opens in the browser, with the scene tree, the materials and the mesh statistics. Nothing is uploaded. If you want it in another program instead, convert it to GLB, which almost everything reads.
Is MS3D a good format to archive in?
MS3D carries geometry, materials, textures and animation, so an archive copy keeps nearly everything. The usual caveat applies: a format is only as future-proof as the readers that exist for it, and .ms3d is well served.
Does converting MS3D lose quality?
Geometry is copied vertex for vertex, so the shape does not degrade. What gets lost is whatever the target format has no field for: convert to STL and the materials go, convert to OBJ and the animation goes. The comparison table on each converter page says exactly which.
Formats that hold the same things
Or go back to the full format reference.