Designates an interface that allows a file viewer to retrieve the handle of the current pinned window or to set a new pinned window. The pinned window is the window in which the current file viewer is displaying a file. When the user selects a new file to view, the shell directs the file viewer to display the new file in the pinned window rather than to create a new window.
The IFileViewerSite interface has the following member functions.
Methods in Vtable Order
| IUnknown Methods | Description |
| QueryInterface | Returns pointers to supported interfaces. |
| AddRef | Increments reference count. |
| Release | Decrements reference count. |
| IFileViewerSite Methods | Description |
| GetPinnedWindow | Retrives the handle of the current pinned window. |
| SetPinnedWindow | Sets a new pinned window. |