On Windows, you must rename it to ZIP and extract it.
On Linux, just right-click on the APK and extract it. By default, Linux recognizes it as an archive file.
On the Mac, I had problems renaming, so I extract the file through Terminal using the unzip xyz.apk -d apkDir
(it will be extracted to the apkDir directory)
Then you will see encrypted Java and XML files that you cannot open (without any extra effort). But you can see and open files from /assets
.
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