Folder size

When I click on My Computer then C:/ in WinExplorer, I see a Size column which shows size of files, but not size of folders. The only files shown are hiberfil and pagefile.

How can I make WinExplorer show Size of FOLDERS?

To ask a computer to compute the size of a folder does not seem unreasonable. There are many benefits to being able to know filesize, being able to sort by filesize, etc.

Thanks in advance. This venue is the best money Microsoft ever spent.