Deprecated in Windows 7. Sets the filter.
HRESULT SetFilter( IShellItemFilter *pFilter );
A pointer to the IShellItemFilter that is to be set.
Returns S_OK if successful, or an error value otherwise.
This method is deprecated in Windows 7.
For operating systems prior to Windows 7. This method can be used if the application needs to perform special filtering to remove some items from the dialog's view. IShellItemFilter::IncludeItem will be called for each item that would normally be included in the view. IShellItemFilter::GetEnumFlagsForItem is not used. To filter by file type, IFileDialog::SetFileTypes should be used, because in folders with a large number of items it may offer better performance than applying an IShellItemFilter.