procedure TForm1.OpenPictureDialog1TypeChange(Sender: TObject);
begin
if OpenPictureDialog1.FilterIndex=1 then
self.OpenPictureDialog1.Options:=[ofAllowMultiSelect]//[ofAllowMultiSelect,...]添加你的选项
else
self.OpenPictureDialog1.Options:=[]; //[...]添加你的选项
end;