The machine in question is a few days old VMWare virtual host on
a (firewalled) campus network, and has no BLODA on it, as far as I can tell.
(the only things installed are Cygwin (fresh full install) and Google
Chrome, in fact).
The issue does not limit iself to tar archives created on Cygwin.
We ran into this while working on porting Sage (sagemath.org) to Cygwin.
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Dmitrii Pasechnik