.CUS File Extension
File TypeAutoCAD Custom Dictionary File
What is a CUS file?
Dictionary file used by AutoCAD, a CAD application used for architectural design and documentation; contains a list of words separated by line breaks in a plain text format; allows users to store a list of spelling exceptions so that the AutoCAD spell checker does not report errors for certain words; commonly contains company names or business acronyms.
Since CUS files are saved in an ASCII text format, they can be viewed and modified with a text editor.