What are the minimum number of edits required to an msi file for the edited vs non-edited versions to be considered two completely different products?

Every MSI file has a GUID which defines what installation it is.

Every MSI file has a GUID which defines what installation it is. If your MSI file has a different GUID to the original, it will be considered a different product. Without knowing more / the script you are using to create the msi, I can't really help further or say exactly what needs to be done, but I hope this helps.

Well, if you get this ORCA program you can open up and msi and see the database inside. I have changed two different GUID's, productcode and upgradecode. So you're saying there's a third guid in there somewhere to change?

– IBC Feb 26 '11 at 4:43.

It turns out that I have to replace the upgradecode in two different places. There's the upgrade code in the Property table, and also the upgradecode in the Upgrade table. Seems a little silly it needs to be in two places...

1 It may be silly for your case, but it allows a single . Msi to upgrade two different product lines, merging them together, merely by adding multiple Upgrade table records. – Michael Urman Feb 28 '11 at 14:06 doesn't seem so silly anymore.

Thanks for enlightening me – IBC Mar 3 '11 at 5:54.

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