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Apple Wiki

The Contextual Menu Extension is an extension in the System Folder on Macintosh computers running Mac OS 8 through Mac OS 9.2.2.

This extension allows the usage of contextual menus. Introduced with Mac OS 8, contextual menus are the Mac equivalents of right-click menus on Windows machines, except for that they appear with the control key held down on a one-button mouse Mac.

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