Warning: can't unlink unverified-consensus on Windows

In legacy/trac#28614 (moved), Vort says:

BTW, clean start of 0.4.0.3-alpha brings another problem: Mar 28 08:26:00.000 [warn] Failed to unlink C:\Users\Vort\AppData\Roaming\tor\unverified-microdesc-consensus: Permission denied

Does this issue happen with an empty data directory? Or does it only happen when unverified-microdesc-consensus exists?

I'm assigning this ticket to ahf, because he has a working Windows box with Tor.

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