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 open APK file and find out what is inside 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.
Here is a quick instructions on how to install and open APK file on your Android device. First download APK file on your device using either Google Chrome or Android browser. Then navigate to the folder where you downloaded APK file and tap on APK icon. Once you do it an installation dialog with pop up. To install the application from APK file just click Install button in this dialog.
Below is a list of files which are typically included in APK package:
If you downloaded a APK file on Android device you can open it by following steps below:
To open APK File on iOS device follow steps below:
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For more general information about how to open APK files, file extension apk and registry you can read one of the following articles: