.ASEC File Extension
Android Secure Application File
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What is an ASEC file?
An ASEC file is a secure application introduced with Froyo, the version 2.2 release of the Android mobile operating system. It stores mobile application data using proprietary encryption and is saved to the .android_secure folder of a device's SD card. ASEC files can be run with the Android SDK emulator.
The secure ASEC format allows applications to exist on mobile devices without being modified or corrupted by other programs.