Experimenting a bit. 

Installing a newer version bundle over an older one causes the old bundle
entry in Add/Remove Programs to be overwritten with the new one, such as
going from bundle version 1.0.0.0 to 1.1.0.0. In the end I only get one
entry. The MSI that's packaged gets a major upgrade. (I assume changing the
bundle's version means replace every package in the chain?)

If I set up a major upgrade at the MSI level--changing the Product's Id and
Version, but do not change the bundle's version, the MSI's files get
replaced with the newer ones. I get two entries in Add/Remove Programs for
the bundle. Both at version 1.0.0.0. Both have to be uninstalled before the
MSI's files are removed. (I take this to mean a major upgrade of the bundle
did not kick in because one version was not higher than the other. So WiX
has no choice but to leave both bundles installed?)

I'm wondering, if I wanted to have one entry in Add/Remove Programs, but do
a major upgrade to only one MSI package in a chain that had, say, five
MSI's. Is that possible? Will Burn upgrade just the one MSI, but not create
a second entry in Add/Remove Programs? Or do you have to change the bundle
version, which I'm guessing would uninstall and reinstall all packages in
the chain? (I could be wrong about that)





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