CUS File – What is .cus file and how to open it?


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CUS File Extension

AutoCAD Custom Dictionary File – file format by Autodesk

CUS is a file extension for an AutoCAD Custom Dictionary File developed by Autodesk. It stores custom words and phrases that are added to the AutoCAD spell checker, allowing users to specify industry-specific or company-specific terms that are not included in the default dictionary.

AutoCAD Custom Dictionary File (CUS)

A CUS file is an AutoCAD Custom Dictionary File utilized in AutoCAD, a computer-aided design (CAD) software application created by Autodesk. It contains a collection of customized or user-defined words, phrases, and abbreviations that are used for autocorrect and spell checking within AutoCAD drawings. CUS files allow users to personalize their AutoCAD experience by adding technical terms, project-specific jargon, or any other specialized vocabulary unique to their workflow.

CUS files play a crucial role in enhancing AutoCAD’s user efficiency and accuracy. By storing user-defined content in a CUS file, AutoCAD can automatically correct common spelling and grammatical errors, and also suggest appropriate replacements for unfamiliar or project-related terms. This reduces the need for manual corrections and ensures consistent terminology throughout drawings, improving overall productivity and communication. CUS files can be easily created, modified, and shared among users, allowing for customization and collaboration within AutoCAD environments.

Software Compatibility

CUS files are primarily associated with AutoCAD, a popular computer-aided design (CAD) software developed by Autodesk. These files serve as custom dictionaries within AutoCAD, containing a collection of specialized terms and abbreviations tailored to specific projects or domains. AutoCAD utilizes CUS files to provide autocorrection and auto-complete functionality for frequently used terms, enhancing the efficiency of drafting and design processes.

Opening CUS Files

To open a CUS file, you will need to have AutoCAD software installed on your computer. Once AutoCAD is open, navigate to the “Preferences” dialog box and select the “Dictionary” tab. In the “Custom dictionaries” section, click on the “Add” button to locate and select the desired CUS file. Once the CUS file is added to AutoCAD, it will be available for use in all new and existing drawings. You can access the custom dictionary by right-clicking within the AutoCAD interface and selecting “Dictionary” from the context menu. The custom terms and abbreviations defined in the CUS file will now be available to use in your CAD drawings.

Autodesk AutoCAD

AutoCAD is a commercial computer-aided design (CAD) and drafting software application. Developed and marketed by Autodesk, AutoCAD was first released in December 1982, running on microcomputers with internal graphics controllers. Before AutoCAD, most commercial CAD programs ran on mainframe computers or minicomputers, with each CAD operator (user) working at a separate graphics terminal. AutoCAD stands for “Automatic Computer Aided Design”. The name “AutoCAD” was coined by John Walker, who later coined the term “dot matrix” for computer printers.

AutoCAD is used by architects, engineers, drafters, urban planners, landscape architects, and other design professionals. It is supported on Microsoft Windows and macOS, and there is also a mobile version for iOS and Android. AutoCAD is the most popular CAD software in the world, with over 10 million users worldwide.

Custom Dictionary Files (CUS)

A CUS file is a custom dictionary file used by AutoCAD. It stores a list of words and their definitions that can be used to check the spelling of text in AutoCAD drawings. CUS files can be created and edited by the user, and they can be shared with other AutoCAD users.

CUS files are plain text files that have the following format:


word1 definition1
word2 definition2

For example, the following CUS file contains two words and their definitions:


house a building for human habitation
dog a domesticated carnivorous mammal that typically has a long snout, an acute sense of smell, and four legs

To use a CUS file in AutoCAD, open the Drawing Settings dialog box (Options > Drawing Settings) and select the Spelling tab. In the Custom Dictionary Files list, click Add and navigate to the CUS file you want to use. Click Open to add the CUS file to the list.

AutoCAD will now use the words in the CUS file to check the spelling of text in drawings. If a word is not found in the CUS file, AutoCAD will flag it as a spelling error.

Other Extensions