hehe, I just noticed a little stupid bug.
I downloaded a 7gb packed as ~100mb rar files. When I CTRL+A windows will calculate the total size and display it in the status line in the bottom of the window. If you then do F5 and do CTRL+A again, it will add the total size to what it just displayed, so it will show as 14gb, next time you do it will show 21gb.. and so on ;p
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