Property Sheet Handlers
Another way the shell can be extended is by custom property sheets. When the
user selects the properties for a file, the shell displays a standard property
sheet. If the registered file type has a property sheet handler, the shell
allows the user to access additional sheets that the handler provides. Property
sheet handlers implement the
IShellPropSheetExt interface.
Property sheet handlers are entered in the registry under the
shellex key within an application's information area. The
PropertySheetHandlers key lists the names of subkeys that contain the class identifier of each
context menu handler, as shown in the following example.
PropertySheetHandlers
{00000000-1111-2222-3333-00000000000002}
You can register multiple property sheet handlers for a file type. In this
case, the order of the subkey names in the
PropertySheetHandlers key determines the order of the additional property sheets. You can use a
maximum of 24 (the value of MAXPROPPAGES) pages in a property sheet.
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