OBB file APK opener OBB is an abbreviation of the words Opaque Binary Blob. This is a file format used by developers of android app to package large files stored by their apps in SD card of a user’s android device. What is meant here is that you may not know, but some files used by some android apps may contain a large or additional app data that is not stored in the … [Read more...] about OBB File Apk opener: How to Extract an OBB file