registering a service - how to set the service executable?

[BryanCrotaz]

I've managed to harvest my project files (on my dev machine, but not on the build server, that's another saga...) into a ComponentGroupRef. Now I want to register the exe as a service using ServiceInstall.

I think that you can only add ServiceInstall to a Component, so I need to nest my ComponentGroupRef inside a new Component and then attach the ServiceInstall tag to it. That seems easy enough -

<Component ...>
  <Fragment>
   <ComponentGroup Id="AgentComponents" Directory="INSTALLFOLDER"/>
  </Fragment>
  <ServiceInstall .../>
</Component>

How do you tell the ServiceInstall to reference the exe file? Or is that automatic? The docs talk about a File element but I don't know how to pull that out of the ComponentGroupRef. The docs say alternatively to use the KeyPath on the Component but the schema doesn't show a KeyPath property.

[barnson]

The docs talk about a FileReference

Where?

[BryanCrotaz]

Odd, I've edited my comment a while ago because I'd misremembered it. They mention a File element not FileReference.
https://wixtoolset.org/docs/schema/wxs/serviceinstall/

[BryanCrotaz]

Another thought, can I have two harvests, one that gets the exe and one that gets everything else? I can't see how to put any exclusions on a HarvestDirectory, e.g. to only harvest dlls