I also tried with a recompiled HTML5 version without compression in Unity, and it still doesn't work... It's surprising because my personal launcher works, but it's 11 Mo...
https://1fichier.com/?qbdeco63m710b1ljy2yk
Here's an example of a simple game not compressed by Unity, which limits the problems. If you manage to run it, I can give you a link to the same game but compressed by Unity and therefore smaller...
https://1fichier.com/?k9m7z59xvkaxbmpxfd12
Here's an example of the same game compressed by Unity (.gz files), which causes problems for local servers. It's unfortunate because the file size is between 30 and 40% smaller, which has a considerable impact on 3D games.
