Customization (CUIx) files define elements that make up the user interface and are edited using the Customize User Interface (CUI) Editor.
The program comes with several different CUIx files that can be tailored to your work environment. AutoCAD-based products have two main designations for CUIx files, main and enterprise; by default the main CUIx file is loaded. You can customize the files that come with the program or create your own CUIx files from scratch using the Transfer tab in the Customize User Interface (CUI) Editor.
When customizing the CUIx files, or creating your own, the Customize User Interface (CUI) Editor creates a backup copy of the file when you first start making changes to the CUIx file. This allows you to restore the file if you delete something that you wanted to keep. If you happen to modify an included CUIx file, you can reset it back to its original state.
The Customize User Interface (CUI) Editor allows you to not only create new user interface elements and commands from scratch, but you can also copy existing user interface elements and commands to modify them.
Loading and using a partial CUIx file allows you to create and modify most user interface elements in a separate CUIx file without changing the customization in the main CUIx file.
An enterprise CUIx file typically stores user interface customization that is shared by many users in a company, but is controlled by a CAD manager. Enterprise CUIx files make maintaining and modifying customization data easier for the individual responsible of controlling company standards.
You can search CUIx files for commands or text strings. You can also replace commands or text strings one at a time or all at once.