That API only works on the currently installing MSI not on other MSIs.
There is nothing wrong with installing your product SxS but if that is your
design, you'll want to evaluate your use of shared resources (such as
registry keys) because they'll just get broken in lots of different ways.
That's basically just a "law of gravity" type problem.

On Tue, Aug 21, 2012 at 9:58 AM, Matt O'Connell <techsupport...@gmail.com>wrote:

> OK fair enough. I was hoping not to have to patch the older product if
> possible. I was hoping WiX might do something like could be done via the
> automation interface'sFeatureRequestState  <
> http://msdn.microsoft.com/en-us/library/windows/desktop/aa371662%28v=vs.85%29.aspx
> >property.
>
> > Is the user expected to remove the old product on
> > their own?
> Yep, we give the users an extensive 'suck it and see' period in which they
> can return in which users frequently run old and new side by side by side.
> Our file formats weren't previously forwards compatible so it would have
> been a bit rude to lock them in to the latest version. Of course this means
> we often hear about users having all previous versions installed.  :-(
>
> Thanks for the pointers.
>
> On 21/08/2012 16:34, Rob Mensching wrote:
> > AFAIK, you can't really do that. You could try to condition the Feature
> and
> > then set something in the new install that causes the old installs
> Feature
> > condition to evaluate to false and then have the user repair the old
> > install. That *might* get the feature to turn off (since it's condition
> is
> > false). Of course, the user experience is pretty odd as well.
> > Shared registry keys that point at paths are often susceptible to this
> > problem. Although, I can't say I quite understand your upgrade path if
> you
> > don't use major upgrades. Is the user expected to remove the old product
> on
> > their own?
> > On Tue, Aug 21, 2012 at 3:09 AM, Matt O'Connell <
> techsupport...@gmail.com>wrote:
> >
> >> Hi WiX users
> >>
> >> I've got a product B that shares a (hidden) feature with it's
> >> predecessor A. If I install A over B the registry we use toggles back
> >> the the old app location. Since we may want to have update B's feature
> >> at some point this is bad.
> >>
> >> My company doesn't like to uninstall the old product via major upgrades
> >> so what is the best way in WiX for me to remove the feaure in app A that
> >> app B wants to also install?
> >>
> >> Many Thanks
> >>
> >>
> >>
> >>
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> threat landscape has changed and how IT managers can respond. Discussions
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-- 
virtually,

   Rob Mensching
   http://RobMensching.com LLC
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will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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