There is Product1 with Component1 of version 1.0.0.0. There is a Product2 with same Component of version 2.0.0.0 of which the Component ID (GUID) value is changed . Now if we do the minor upgrade from Product1 to Product2 , will the component be updated from 1.0.0.0 to 2.0.0.0 . Or will it remain same as the GUID value is changed?
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See this old answer for more details: When to change component GUIDs?
Component GUIDs should remain stable between releases unless you move the keyfile of the component to a new absolute location on disk (you move the file in your source hierarchy relative to your other files - target destination on disk can vary depending on where you install as base-folder - INSTALLDIR). In that case it is treated as a new file and should be given a new identity - which means a new component GUID.
The component GUID identifies a keyfile at a specific location, the GUID does not "follow the file around" if it moves to a different location on disk.
If the file remains stable on disk, the component ID does the work of reference counting and identifying the same file across releases.
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Stein Åsmul
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