[wix-users] WixShellExecTarget with Value="[#myapp.exe]" keeps unresolved

[Yuri Tkachenko]

Hi!
I am trying to adopt this guide: http://wixtoolset.org/documentation/manual/v3/howtos/ui_and_localization/run_program_after_install.html

and ended up with 
https://github.com/ubergrape/grape-electron/blob/master/resources/windows/installer.wxl#L106-L111

However the `[#$(var.exeName)]` keeps beeing unresolved.
here is string from logfile:
`Property(S): WixShellExecTarget = [#Grape.exe]`

and if I explicitly write down 
`<Property Id="WixShellExecTarget" Value="С:\Program Files\Grape\Grape.exe" />` and of course don't change path while installing, I could launch app after install. 

Why this `[#$(var.exeName)]` resolves into [#Grape.exe] but not into full path? 
Full config https://github.com/ubergrape/grape-electron/blob/master/resources/windows/installer.wxl

Thanks.