Hi johnmc, have been testing these days. I will try to report it all: - Changing the code from x0816 to x0809: 1. Been able to integrate MSI 4.5; 2. Slipstreaming WMP11 plus all it's hotfixes with WMP11 Slipstreamer, had no issues; 3. Slipstreaming WMP11 with the Slipstreamer went well but integrating it's hotfixes with nLite, some localized hotfixes failed, not all of them, but via command line all localized hotfixes failed; 4. Integrating, for example, Windows Package Installer "WindowsXP-KB898461-x86-PTG", portuguese version, failed to integrate with nLite and via command line, so as other portuguese hotfixes; Conclusion: All those localized hotfixes that can't be directly integrated i.e. can only be with the regular integration method, nLite reports error. Integrating via command line they will all fail since it is used the regular integration method for all of them, even the one's that nLite directly integrates. With WMP11 Slipstreamer had no issues with it's hotfixes because they are all slipstreamed into the Windows source. Finally, in order to get it all working: 1. Changed "INSTALL_LANGUAGE" code in the Hivesys.inf file; 2. Integrated MSI 4.5 via command line; 3. Returned the code to it's original; 4. And then used nLite for all the rest. I even add WindowsXP-KB958655-x86-ENU hotfix (updates the msi.dll file from 4.5.6001.22159 version to 4.5.6001.22299 version), which nLite directly integrates, and at the end everything was working. Even msiexec was in portuguese language. I hope I had been clear enough! Any question just ask, if it is needed I will edit the post! Cheers