Check out some options how apk files might be converted to obb format.
You can use Android Studio the generate .obb file for a specific .apk package to fit in the 50 mb limit of Google Market. But that's not actually a conversion.
Once you have the .obb file you need to place it obb folder for the specific app / game. Something gamers often need when they are trying to install android games with obb files.
Unfortunately, there is no detailed software record in the database for this conversion.
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