After testing I see that we can't integrate the MUI language with the msu file (Error 50, unattend file not found)! 1) First, It's needed to extract the files inside MUI language file: Example with french language : C:\IE9-Windows6.1-LanguagePack-x86-fra.msu /extract:C:\IE9 Use a batch to integrate the files with DISM Integrate first IE9-win7.msu and after the file Windows6.1-KB982861-x86.cab (extracted from IE9-Windows6.1-LanguagePack-x86-fra.msu) Adapt to your needs (paths and x86 or x64 versions and index): IE9.cmd @echo off Color 0A echo. "C:\Program Files\Windows AIK\Tools\x86\Servicing\Dism.exe" /Mount-Wim /Wimfile:"C:\Se7en_SP1\sources\install.wim" /index:1 /MountDir:"C:\work" timeout /t 3 "C:\Program Files\Windows AIK\Tools\x86\Servicing\Dism.exe" /Image:"C:\work" /Add-Package /PackagePath:"C:\IE9\IE9-win7.msu" timeout /t 3 "C:\Program Files\Windows AIK\Tools\x86\Servicing\Dism.exe" /Image:"C:\work" /Add-Package /PackagePath:"C:\IE9\Windows6.1-KB982861-x86.cab" timeout /t 3 "C:\Program Files\Windows AIK\Tools\x86\Servicing\Dism.exe" /Unmount-Wim /MountDir:"C:\work" /Commit pause to see if errors IE9 integration Images IE9 installed Image Voilà! The integration will be successful Thanks but it's too advanced for me, I could only extract the file Windows6.1-KB982861-x64, but I can't use the command DISM and neither program batch . I'll wait to microsoft release a IE9.MSU in Spanish to integrate with rt7lite, thanks again...