What you will learn
Learn how XAPK bundles store OBB expansion files and where those files belong on Android.
Why XAPK files include OBB data
Large Android games often keep media, levels, maps or other heavy assets outside the APK. Those expansion files are usually stored as OBB files and bundled with the APK inside an XAPK package.
If the APK installs but the game downloads data again or fails to launch, missing or misplaced OBB files are a common cause.
What OBB files look like
| File | Meaning | Install location |
|---|---|---|
main.123.package.name.obb | Main expansion file. | Android/obb/package.name/ |
patch.123.package.name.obb | Patch or additional expansion data. | Android/obb/package.name/ |
Android/obb/package.name/ | Standard folder path inside some archives. | Keep the same package folder. |
Step 1: Open the XAPK locally
Use the OBB Extractor to scan the XAPK or ZIP archive for OBB files. The tool runs locally in your browser and lists the detected file names and sizes.
Step 2: Confirm the package name
The OBB folder name should match the Android package id, such as com.example.game. If the archive includes APK metadata, compare it with the folder path before copying files.
| Signal | Where to find it | Why it matters |
|---|---|---|
| Package name | APK manifest or XAPK metadata. | The OBB folder must use the same package id. |
| Version code in OBB name | main.123.package.name.obb | Helps match expansion data to an app build. |
| OBB folder path | Archive path such as Android/obb/package.name/. | Shows where the files probably belong on device. |
| APK split list | XAPK package contents. | Split APKs must be installed before OBB data can help. |
Step 3: Place OBB files correctly
On the Android device, OBB files normally belong in Android/obb/package.name/. Keep the exact package folder and avoid renaming the OBB file unless the original source explicitly requires it.
What to do with APK files
If the same XAPK also includes APK or split APK files, install those first. Split APK packages must be installed together before the OBB files will be useful.
OBB troubleshooting checklist
| Problem | Likely cause | Fix |
|---|---|---|
| Game downloads data again | OBB files are missing or in the wrong folder. | Copy them to Android/obb/package.name/. |
| Game crashes after launch | Version mismatch or incomplete expansion data. | Check file size and match the OBB to the APK version. |
| Only one OBB copied | A patch OBB was left behind. | Keep main and patch files together when both exist. |
| Package name is unclear | The folder path and APK manifest do not match. | Inspect the related APK in APK Analyzer. |
Privacy note
OBB files can be very large. Browser-based extraction avoids uploading private game data to a server, but very large archives may still perform better on desktop devices.
Responsible use note
Use these tools only with apps you own, develop, or have permission to analyze. Avoid modifying, redistributing, or installing packages from sources you do not trust.