Folder Size Shell Extension - Version 3.1 A free shell extension for Windows 95/98 and NT. It adds a new tab to the Properties dialog that displays a folder's and drive's size. This new page allows you see the folders and sub folders sizes (in a hierarchical tree). To access to the options (units, sort, etc.) a contextual menu is provided. Folder Size Shell Extension delivers useful information and integrates well into Windows 95/98 and NT's existing structure.