Open File Extension APK
File extension APK is short for Android Package. This file extension is used by Android system to deliver and install application packages on Google Android operating system.
APK file has all information required to install application on Android system including code and resources.
To find out what is inside APK file you can use following trick. Change extension of APK file to ZIP and double click on it. Since APK is compressed using ZIP algorithm it will be opened by Windows and you will see its contents. Note that most of the information inside APK file is compiled code which is impossible to read. But you can extract images and other resources using this method.
More Information — File extension APK
For more general information about files, file extensions and registry you can read one of the following articles:
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