Overview
Adding language packs directly to a Windows ISO lets you deploy multilingual images without downloading languages after installation. This is ideal for offline environments and standardized deployments. Using DISM you can inject language cabs into the image. This guide explains the process.
Key Takeaways
- Language packs can be slipstreamed into the install.wim with DISM.
- You need the matching Language Pack (LP) cab files for your Windows version.
- DISM mounts the image, adds the package, then commits the change.
- The languages become available immediately after installation.
Note: Obtain language pack cabs that exactly match your Windows version and build; mismatched packs will not apply.
Mount and Add the Language
1. Extract the ISO and open an elevated Command Prompt in that folder.
2. Find the image index: DISM /Get-WimInfo /WimFile:sources\install.wim
3. Mount it: DISM /Mount-Wim /WimFile:sources\install.wim /Index:<n> /MountDir:mount
4. Add the pack: DISM /Image:mount /Add-Package /PackagePath:"C:\lang\lp.cab"
Commit and Rebuild
1. Verify the language: DISM /Image:mount /Get-Intl
2. Commit and unmount: DISM /Unmount-Wim /MountDir:mount /Commit
3. Repackage the folder into a bootable ISO with the ADK oscdimg tool.
4. Test the ISO and confirm the new language is selectable.
Troubleshooting
Problem: The language pack is not applicable.
Solution: Use cabs that match the exact Windows edition, version, and architecture of the mounted image.
Problem: The mount fails or the folder is locked.
Solution: Run DISM /Cleanup-Mountpoints and use an empty mount directory before retrying.
Problem: The language does not appear after install.
Solution: Confirm the package committed successfully and that you rebuilt the ISO from the updated files.
Problem: The rebuilt ISO will not boot.
Solution: Recreate it with oscdimg using the correct boot parameters rather than a generic ISO tool.
Conclusion
Slipstreaming language packs produces install media that is multilingual from first boot. Once comfortable with DISM, maintaining localized deployment images becomes routine.
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