As per Android 7.0 . An Android APK is no longer zip file #75
Description
Version 2 introduces a new APK signing mechanism, starting in Android 7.0 (Nougat). Since that version, the Android application package's format has changed, and now differs slightly from a normal ZIP file.
The modification consists in adding a special block in the ZIP file, called the APK Signing Block.
resulting in
File is not a zip file
** Done with nothing. ¯_(ツ)_/¯