The Download APK files are used to install apps on Android devices. You need an Android emulator to open APK files on a computer. APK files are in ZIP format and can be extracted using ZIP tools.

How to Open a Bin File on Android. Android applications come in the Android Package (.APK) ...

Just that makes managing files much easier. To access the Apkshellext2 tools, right click on an APK and open the APK Shell Extension menu item.