shows sizes of folders seen in Explorer windows! In Windows 2000 and XP, shell extensions can augment Explorer’s columns to show you Folder Sizes right where they should be, as shown in the screenshot. In Windows Vista and higher (7 and 8), Explorer is not as customizable. Try the new beta client for Vista and higher that opens pop-up Folder Size windows that track open Explorer windows! They kind of get in the way, so there’s also a tray icon to toggle them off. I’m trying to keep it light and elegant, not too complicated…