Default [Q] Virus Issue or False Positive?

I use the K9 email client on my Note 3 9005. On Win8.1, Windows Defender is giving Trojan alerts for K9 in the backups I have copied across to the PC. Running Avast on the phone doesn't give any alerts at all.

Specifically,
Win32/Waledac.Aj
Win32/Lerspeng.B
Win32/Miuref.A
Win32/Injector.gen!ER
Win32/Muiref
Win32/Danglo!gmb
Win32/CeeInject
Win32/Lerspeng.A

I'm presuming false positives as these are Android files but the number of them causes some concern. Does anyone have more info re these?
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