TreeSize Professional now ships with a shell extension that adds an additional column to the Windows Explorer. It shows the size not only for files but also for folders. This feature is intended for a quick overview. The new column can be activated using Choose Columns/Details in the View menu of the Windows Explorer or through the context menu of the column headers of the Windows Explorer. If you would like to enable this column in the Windows Explorer for all folders, then you have to configure this in the Folder Options of the Windows Explorer using the button Apply to All Folders. This column requires Windows XP and can be configured or fully turned off in the Options dialog. On 64Bit Windows systems, the .Net framework 2.0 or higher is required.

Unfortunately it is not possible to provide such an extension for the Explorer of Windows Vista or higher, because Microsoft has removed the used interface from this version of Windows. Microsoft has officially confirmed that a similar extension of the Explorer is not possible under Windows Vista or higher.
Note: You have to choose Install TreeSize column for Windows Explorer within the TreeSize Installation. Otherwise the TreeSize column will not be available.

