The package code is a GUID identifying a particular Windows Installer package. The package code associates an.msi file with an application or product and can also be used for the verification of sources. The product and package codes are not interchangeable. No two nonidentical.msi files should ever have the same package code. Although it is common to ship an application that has the same package code and product code, the two values can diverge as the application is updated. For more information, see Package Codes.
Some companies use package codes to keep track of installed applications or the components of applications. For example, package codes can be used for the storage or retrieval of catalog records in retail inventory or for the storage of records of application installations in an enterprise infrastructure.
The product version is a GUID that is the principal identification of an application or product. For more information, see the ProductVersion property. If significant changes are made to a product then the product version should also be changed to reflect this. It is not however a requirement that the product version be changed if the changes to the product are relatively minor.
For example, the product version of the Notepad program is 188.8.131.52. The product version represents the build number, the revision number, and the service pack number. In this example, Notepad was first released on September 15, 2004 and version 3.3 of Notepad was released on July 9, 2006 and version 3.3.2 was released on May 18, 2006. There were no service packs for Notepad version 3.3.0 and no service packs were released for Notepad version 3.3.1.
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