I just installed calibre 64bit on a new windows 10 machine - control panel reports 199MB, File Menu Tools reports Program Files\Calibre 2 as 198.4.
On my current machine control panel reports 277MB (empty cache, no temporaries, 17.2 MB config, after a restart), FMT is the same - 198.4. This machine is a Win 7->Win10 upgrade and it has had 32bit calibre installed from time to time.
BR
New machine is an alienware alpha, came with an XBox controller. It's 'bout the size of a modest box of chocolates - cute
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