Sorry about that. For furture reference, it was meant to be all on one line like this:
"C:\Users\yourusername\AppData\Local\Programs\Opera\launcher.exe" "--user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36"where you replace yourusername with the name of your user folder in "C:\Users". That's assuming you only installed Opera for the current user.
More specifically, you take the "install" path that you see at the URL opera://about and go like this:
"the_install_path\launcher.exe" "--user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36"(specifically opera.exe instead of launcher.exe in new Operas)
You can open a command prompt and make sure the command works first before trying to create a shortcut with it.
videos are working again.
Nice.