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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