Okay, I was missing a conditional invocation of the custom action to set the
variable and the variable must be enclosed in [ ] in the setting custom
action. This final code works:
<Fragment>
<Property Id="VS12_ROOT_FOLDER_EXISTS" Secure="yes">
<RegistrySearch Id="SearchForVS12RootPath" Root="HKLM"
Key="Software\Microsoft\VisualStudio\SxS\VS7" Name="12.0" Type="raw" />
</Property>
<CustomAction Id="SetVS12_ROOT_FOLDER" Directory="VS12_ROOT_FOLDER"
Value="[VS12_ROOT_FOLDER_EXISTS]" />
<InstallExecuteSequence>
<Custom Action="SetVS12_ROOT_FOLDER" Before="InstallFiles"
Overridable="yes">VS12_ROOT_FOLDER_EXISTS</Custom>
</InstallExecuteSequence>
</Fragment>
--
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