Sounds like you broke component rules somewhere...  Are your component ID's 
identical for the same files across MSI's?  Are you using  version info on the 
files in question, or is it falling back to timestamp and hash checking?

-----Original Message-----
From: Tobias Markmann [mailto:tmarkm...@googlemail.com] 
Sent: Thursday, March 26, 2015 7:08 AM
To: General discussion about the WiX toolset.
Subject: Re: [WiX-users] Keep Desktop Shortcuts and Pinned Task Bar Icons with 
Upgrades

Hi Rob,

On Thu, Mar 26, 2015 at 12:27 AM, Rob Mensching <r...@firegiant.com> wrote:

> Schedule your upgrade late and carefully adhere to the Component Rules.
>

Thanks for the hint. I googled a bit and read up things on MajorUpgrade 
scheduling [0] and Component Rules, including [1] and [2].

So I've tried scheduling the upgrade later. Specifically I've added 
Schedule="afterInstallExecute" to the MajorUpgrade, see [4].

Now it seems to first overwrite the existing installation and then runs the 
uninstall process. The shortcut and pinned task bar icons are retained.
However the uninstall progress removes the overwritten files so that the 
shortcut points to a broken installation.

Why does it remove the now newer version installation files during uninstall?
I expected MSI to know that the files in the program folder are of a newer 
installation when it starts the uninstall process and only deletes files which 
haven't been replaced during installation.

Thanks in advance for any pointers and hints.

Cheers,
Tobias

[0]
http://wixtoolset.org/documentation/manual/v3/howtos/updates/major_upgrade.html
[1]
http://robmensching.com/blog/posts/2003/10/4/windows-installer-components-introduction/
[2] http://robmensching.com/blog/posts/2003/10/18/component-rules-101/
[3]
https://dl.dropboxusercontent.com/u/14672346/tmp/swift/swift_wix_install_msi_log.txt
[4]
https://github.com/swift/swift/blob/master/Swift/Packaging/WiX/Swift.wxs#L13
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