.CSM File Extension
File Type 1Steam Game Backup File
What is a CSM file?
To restore a CSM backup file, selectand choose the file. The CSM file is located with other CSD and SIS backup files in the appropriate game folder in the "Steam Backups" folder.
File Type 2Character Studio Marker File
.CSM File Association 2
ASCII text file that contains position markers for a 3D character; used by Character Studio, a biped animation tool included with Autodesk's 3ds Max program; saves the position of the biped in the software's motion capture buffer.
Limb rotation data is not stored in CSM files, but is saved related .BVH files.