What is .MSH file extension?
Proprietary 3D model mesh format used by Orbiter, a free space flight simulation program; saves the three-dimensional structure of a shuttle, station, or another space object; uses ASCII text formatting and specifies vertices and mesh groups for different parts of the model, as well as the textures (.DDS files) and materials to apply to the model.
MSH files are saved in the \Meshes\ folder of the software installation.
You can see a list of software programs here on www.easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.