I went the launcher route for simplicity on my end in reality. It makes it very easy to deploy a new client version or new asset without much struggle on anyone's end. I think that error might be due to the cause of failed TLS validation after some searching. I built the launcher for Windows as well and to my knowledge it relies on native-tls by default. My best assumption is the cert store for your Windows emulation is empty or just non-existent. How are you emulating the environment and I can try and help some more!
EDIT: Very sorry I only half read the title and I very clearly am only half awake as well. I am just going to release a new launcher version that SHOULD support most Windows emulators regardless.