Android apps for Windows 10 can be published to Windows Store in APK files.

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'During the 2015 Build keynote, Microsoft announced efforts to ease the porting of Android and iOS software to run on Windows 10 for mobile. The operating system will feature a runtime environment for Android software (codenamed "Astoria")...'

https://en.m.wikipedia.org/wiki/Windows_10_(mobile)

 

[xandros9]

I believe most of the community was well aware of that on the announcement day.