.CUI File Extension
File TypeAutodesk Custom Workspace File
What is a CUI file?
Saves workspace settings for AutoCAD architectural drawing and engineering software as well as for 3ds Max 3D modeling software; contains toolbar and menu configuration settings as well as the layout for windows and palettes; used for setting up the workspace for different modeling, rendering, and animation tasks.
CUI files can be used for loading and saving full or partial custom workspaces.