Package AIR app as Appx for Windows Store

Has anyone successfully packaged as AIR app as an Appx (or similar) to submit to the Windows Play Store?

The process looks relatively straight forward (To make a Metro Appx Package from scratch, you must first …), but not so fast...

The first step is creating an AppxManifest.xml file, and here I get stuck:

<Applications>

  <Application Id="MyAppId"

  Executable="MyApp.exe"

  EntryPoint="MyApp.App">

I've created my app as signed application with native runtime.  The value for Executable is my app's executable.  But what should I put as the EntryPoint?  Does an AIR app even have an EntryPoint?  MakeAppx.exe will not run if EntryPoint is left out or left blank.

Thanks!