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Do you have to trigger a Major upgrade with a Windows Installer if one of the files has changed since the previous install?

+1  A: 

No, you can get away with a minor upgrade. See the MSDN Documentation for more information.

A minor upgrade can be used to add new features and components but cannot reorganize the feature-component tree. Minor upgrades provide product differentiation without actually defining a different product. A typical minor upgrade includes all fixes in previous small updates combined into a patch. A minor upgrade is also commonly referred to as a service pack (SP) update.

Basically you can update files without any problems.

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