What are the implications of two files having the same component GUID
but different key paths in different installers?
Some background:
* Release N-1 has a COM component with component guid G and the key
path COMDll${N-1}.dll with related registry keys as part of the component
* Release N has a COM component with the same COM interface guid along
with the same component guid G but the key path is instead COMDll${N}.dll
Release N is written with WiX and N-1 uses InstallShield.
The reason the installer was done this way was because we found when
uninstalling the trial of Release N, the registration would be removed
for the new component and Release N-1 would no longer work. Bad! I
realize this is a physical application design problem (the COM
components are poorly versioned.)
The problem I have in the above situation is when I uninstall Release
N-1 with Release N also installed, it uninstalls the component with guid
G. When this happens, Release N no longer works as the relevant registry
keys are deleted. This happens even though the reference count appears
to be 2. I say appears to be because I see the following in the log file:
RegClassInfoUnregister(Feature=NewFeature1,Component=${GUID}[~]2,FileName=TOKEN,ClsId=...)
I'm presuming that the [~]2 means that there are two references to the
GUID but I'm not sure. I can't really find any information on this log
statement.
So my question is: is there a way to have the uninstall of Release N-1
leave a component with a specific GUID "installed twice" in place even
though the key paths are different? Is the key path causing a problem?
I also realize this is a MSI question more than a WiX question but I
have found this user group to be very knowledgeable so I hope that this
slightly tangential topic will be of interest to someone!
Thanks for your time :)
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