MAKEMSI quickly and reliably creates MSI files in a non-programmatic way
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Have your say! Join the MAKEMSI discussion list or view archive! Suggest improvements. No question too simple or too complex.
\->Windows Installer FAQ (the basics)->GUIDS->UpgradeCode

UpgradeCode

The "UpgradeCode" property should contain a GUID. It is used to identify a product or product family and MAKEMSI uses it by default to automatically uninstall any already installed version of your product before the install "proper" begins.

See these sections for more information:

The simplest way of supplying one to a MAKEMSI script is to provide it in the product section of a version file, for example (from "TryMe.ver"): 

; Guid.UpgradeCode = {7EF333CB-3BB9-457D-831E-8482E50F2999}

Microsoft awarded me an MVP (Most Valuable Professional award) in 2004, 2005, 2006, 2007, 2008 & 2009 for the Windows SDK (Windows Installer) area.Please email me any feedback, additional information or corrections.
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Microsoft awarded me an MVP (Most Valuable Professional award) in 2004, 2005, 2006, 2007, 2008 & 2009 for the Windows SDK (Windows Installer) area.