Creating Patch / Upgrade installer

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Creating Patch / Upgrade installer

Otty
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Hi All,

I have a question about creating patch or upgrade installer.
We have created a msi installer with WIX where the components are generated during building of our WIX projects. In the our WIX project file we generate a file (.wxs) that  contains the components. The components don't have a fixed GUID number.  

Is there a way to create a patch or an upgrade installer on a msi installer where the components don't have a fixed GUID number?

If it is not possible, how can I generate components at every build with a fixed GUID number?

Kind regards
Otty