ProductID, UpgradeCode, ApplicationShortcut and MSI

[pkvector]

Hi all,

I've written a C# app which uses Wix Toolset for installation.

The app has started being installed by users and I had the sudden panic that I had GUIDs in my WXS file that may not be unique.

I use "*" for ProductID.

And then for UpgradeCode, and also , I am using GUID which I don't recall if I generated or not.

I guess, I have the sudden (possibly non-rational) fear that my installer could modify an existing application on user's PC or even worse, server.

I've done a bit of digging and found lots of references to UpgradeCode GUID being the sole identifier for existing apps, for upgrading. Surely MSI does more intelligence to make sure a new app getting installed, which happens to use the same UpgradeCode as an existing app, that the existing app doesn't mistakenly get deleted?

Am I paranoid?