An1.zip -

: If you have an an1.zip file from this site, it likely contains an APK and additional "OBB" data files required for a game to run. You would typically need to extract the zip and place the OBB folder into your Android device's /Internal Storage/Android/obb/ directory.

:In a technical software context, .an1 is a specific file extension used by DeLorme Street Atlas USA , a now-discontinued mapping software. an1.zip

: Ensure you downloaded it from a reputable site. : If you have an an1