I am not familiar with the "Hostbridge" procedure, from the videos it is not clear which tool is used
https://youtu.be/H9eV1YCAkaU
The original efforts regarding launch of host applications came from Pascal Papara, who developed a tool for his AEROS distribution. I asked him if I could use it as well, but he told me I should have tailored a Linux distribution around it to maked it work properly. This brought me to find a different solution to reach the same goal, since having hostbridge work on as-many-as-possible distros was mandatory, and extending it to Windows would have been a nice addon.
There is no winlaunch in hostbridge. Just one of my PoorX tools (one for Linux, one for Windows) delivering a message in a bottle to the host operating system, and a little daemon waiting for that message to come, ready to do what the message states. By the way, trying to turn this daemon from its original scripting form to a executable, popped up dozens of security warnings in latest Windows releases, since I could not afford a digital 'signature' for my software, which would have raised less concerns. So I stepped back to the script.
By the way, hostbridge is not just a launcher for host applications. It's step #1 to use Icaros Desktop as a desktop replacement for your host operating system.