.rhi installer - can I add windows registry key during install process?

We are creating custom plugin for our process and part of our plugin process we are creating custom file with custom .xyz extension. We want to give icon to this file by creating Windows Registry key. Is there a way we can add this step in .rhi generation?

I don’t think that is part of an RHI function, it simply unzips your RHI package into a folder. If you need elevated permissions (such as if you are trying to write to HKLM) then you will need a real installer tool.

Actual Installer is an inexpensive, easy-to-user solution: