MAKEMSI quickly and reliably creates MSI files in a non-programmatic way
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\->Windows Installer 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 for the Windows SDK (Windows Installer) area.This external link was OK when tested at 15 Nov 2008Please email me any feedback, additional information or corrections.
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Saturday November 15 2008 at 2:05pm
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Microsoft awarded me an MVP (Most Valuable Professional award) in 2004, 2005, 2006 & 2007 for the Windows SDK (Windows Installer) area.This external link was OK when tested at 15 Nov 2008