Are you kidding? Then everyone and their mother would be trying it, and reporting (USER) errors! In fact, there is no download for CABARC.EXE only, though it is included with many, many Microsoft kits (CABSDK, IEAK, WM Enterprise Deployment, etc.). I figure that those who do not have it probably are not worried about running this from SVCPACK.INF. Which brings me to your second point. Of course I did not post it until I tested it, and if it would not work in SVCPACK.INF, it is not for me! The reason one sometimes has trouble with MSIEXEC.EXE is not because MSIEXEC.EXE is not "found", but because the *.MSI file must have either the full path specification, or be in the current, working directory. In this case, it is in the current directory, in order to avoid the need for hardcoded paths. Note that MSIEXEC.EXE in NOT included in the final package. CABARC.EXE, on the other hand, IS. will this work with XPCREATE? also does this update still have to be installed after MP10?