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How to extract msu/msp/msi/exe files from the command line

Microsoft Hotfix Installer (.exe)

setup.exe /t:C:<target_dir> /c

Microsoft Update Standalone Package (.msu)

expand -F:* update.msu C:<target_dir>
cd <target_dir>
expand -F:* update.cab C:<target_dir>

Microsoft Patch File (.msp)

msix patch.msp /out C:<target_dir>
msix.zip

Windows Installer Package (.msi)

msiexec /a setup.msi /qb TARGETDIR=C:<target_dir>

http://www.windowswiki.info/2009/02/19/how-to-extract-msumspmsiexe-files-from-the-command-line/