I'm not sure what the point would be, unless it's to bypass the setup.exe used by the program.msi. Even then, most of those you can just write a setup.ini to designate certain variables. Any stand-alone .msi starts the Installer service when you click it. I am very curious as to the application of this project. Not being skeptical by any means, just genuinely intrigued. By the way, UniExtractor uses E_WISE to decompile the .msi, you can find the source code (Pascal) here. Also, you've likely already played with them, but here are the parameters that apply to msiexec.exe: Windows ® Installer. V 3.01.4000.1823 msiexec /Option <Required Parameter> [Optional Parameter] Install Options </package | /i> <Product.msi> Installs or configures a product /a <Product.msi> Administrative install - Installs a product on the netwo /j<u|m> <Product.msi> [/t <Transform List>] [/g <Language ID Advertises a product - m to all users, u to current use </uninstall | /x> <Product.msi | ProductCode> Uninstalls the product Display Options /quiet Quiet mode, no user interaction /passive Unattended mode - progress bar only /q[n|b|r|f] Sets user interface level n - No UI b - Basic UI r - Reduced UI f - Full UI (default) /help Help information Restart Options /norestart Do not restart after the installation is complete /promptrestart Prompts the user for restart if necessary /forcerestart Always restart the computer after installation Logging Options /l[i|w|e|a|r|u|c|m|o|p|v|x|+|!|*] <LogFile> i - Status messages w - Nonfatal warnings e - All error messages a - Start up of actions r - Action-specific records u - User requests c - Initial UI parameters m - Out-of-memory or fatal exit information o - Out-of-disk-space messages p - Terminal properties v - Verbose output x - Extra debugging information + - Append to existing log file ! - Flush each line to the log * - Log all information, except for v and x options /log <LogFile> Equivalent of /l* <LogFile> Update Options /update <Update1.msp>[;Update2.msp] Applies update(s) /uninstall <PatchCodeGuid>[;Update2.msp] /package <Produ Remove update(s) for a product Repair Options /f[p|e|c|m|s|o|d|a|u|v] <Product.msi | ProductCode> Repairs a product p - only if file is missing o - if file is missing or an older version is installed (def e - if file is missing or an equal or older version is inst d - if file is missing or a different version is installed c - if file is missing or checksum does not match the a - forces all files to be reinstalled u - all required user-specific registry entries (default) m - all required computer-specific registry entries (def s - all existing shortcuts (default) v - runs from source and recaches local package Setting Public Properties [PROPERTY=PropertyValue] Consult the Windows ® Installer SDK for additional documentation on the command line syntax. Copyright © Microsoft Corporation. All rights reserved. Portions of this software are based in part on the work of the Independent JPEG Group.