I'm running Kubuntu21.10. I've downloaded a music-playing file named 128.m3u. I can get it to play music from a browser, e.g., Firefox, by accessing it via "Open File'. How can I turn it into a URL? I've tried things like file://paul/Downloads/128.m3u, but I haven't found the right combination. Another way of describing what I need is a URL that provides the equivalent of the "Open File" command in a browser.
I want to turn it into a URL and not just play it directly because I want to install it as an entry in my music player. For that I need a URL.