Managed to get TinyGo programs to run on Windows XP!
Why? For curiosity mostly, I hope nobody is still seriously running Windows XP in production (though I probably should know better).
PR: https://github.com/tinygo-org/tinygo/pull/4629
Some APIs we were using are only available starting with Windows 7, so I had to fall back to older APIs for GOOS=386. It can be used using GOOS=windows GOARCH=386.