Tilde at foldersize on C-drive (not on other drives)

Just curious to know why foldersizes on C-Drive are sometimes showing a tilde
whereas this is not the case on other drives.

I mean like this..

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Help file is your friend gpsoft.com.au/help/opus11/in ... _Sizes.htm

Thanks a lot!
Admittedly I didn't look there :blush: , but rather searched this forum on 'tilde' and subsequently, in the results, on 'folders'.