Designates an interface that allows a property sheet handler to add or replace pages in the property sheet for a file object.
Methods in Vtable Order
| IUnknown Methods | Description |
| QueryInterface | Returns pointers to supported interfaces. |
| AddRef | Increments reference count. |
| Release | Decrements reference count. |
| IShellPropSheetExt Methods | Description |
| AddPages | Adds one or more pages to a property sheet for a file object. |
| ReplacePage | Replaces a page in a property sheet for a control panel object. |