INFO: MayChangeDefault Key Needed for IContextMenu to Be Called in Response to a Double-Click

• Microsoft Win32 Software Development Kit (SDK), on platform(s):
  • Microsoft Windows versions 95, 98
  • Microsoft Windows NT 4.0

SUMMARY

For a context menu's QueryContextMenu function to be called in response to a double-click on a file object already associated with the context menu, the MayChangeDefaultMenu key must be added to the registry as follows:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CLSID}\ShellExt\MayChangeDefaultMenu

where {CLSID} is the CLSID for the context menu extension.

MORE INFORMATION

In IContextMenu::QueryContextMenu(), the CMF_DEFAULTONLY flag is set when the user is activating the default action, typically by double-clicking. This flag provides a hint for the context menu extension to add nothing if it does not modify the default item in the menu. A context menu extension or drag-and-drop handler should not add any menu items if this value is specified. A namespace extension should add only the default item (if any).

Additional query words: doubleclick

Keywords          : kbContMenu kbExtension kbSDKPlatform kbGrpShell 
Version           : WINDOWS:95,98
Platform          : WINDOWS 
Issue type        : kbinfo 

Last Reviewed: February 27, 1999