Google Play "missing icon"

Even after upgrading to AIR 3.7 and successfully packaging a 96x96 icon, Google Play is still rejecting my APK because an "icon is missing". What else could there possibly be?

<image36x36>Icons/36x36.png</image36x36>

<image48x48>Icons/48x48.png</image48x48>

<image72x72>Icons/72x72.png</image72x72>

<image96x96>Icons/96x96.png</image96x96>

As far as I can see, those 4 are all that are specified in their official advice:

http://developer.android.com/guide/practices/ui_guidelines/icon_design_launcher.html