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Chapter 33. Advanced Customization > Understanding AutoCAD Menu File Types

Understanding AutoCAD Menu File Types

The menus used by AutoCAD are defined by various menu files. The files that you are concerned with in customization work are in standard text-file format that you can easily modify. You can also define new menus. If you create or edit a menu, you assign items to the menu. You associate menu macros to these items that perform specific AutoCAD functions. A menu macro can be as simple as a sequence of standard AutoCAD commands or as complex as a combination of commands and AutoLISP or DIESEL code or a combination of all three. Menu macros can be thought of as “command strings.” If the user picks a menu item, the associated macro is executed. Later in this chapter, you learn how to construct menu macros. The menu files also describe the appearance and position of menu items in relation to the overall AutoCAD user interface.

There are several types of menu files, each distinguished by its file extension. These types include MNU, MNS, MNC, MNR, and MNL files. The base AutoCAD menu, for example, is called ACAD.MNU. For this base file there is also an associated ACAD.MNS, ACAD.MNC, ACAD.MNR, and ACAD.MNL file. The function and format of the various menu file types are described in Table 33.1.


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