Somehow we ended up with something going wrong with one of our recently deployed upgrades (internal deploy, only about a dozen machines or so) and there are now 2 entries for our program showing up in windows add/remove program and I’m trying to figure out what could have caused this. In a nutshell what does windows use to determine whether a program is replacing a previous version or if it’s a new program?
We are using WiX to create our installers, but nothing in the SVN revisions shows much out of the ordinary (been working fine for the past year with over 100 upgrades). Product version is * because we’re forcing a major upgrade each time, but the upgrade code has never changed.
What turned out to be the issue was that the [revision] part of the version number isn’t checked and we’d occasionally have internal releases that differed only in [revision] number.