I am tired of the 40,000 channels and groups that I don't want ever watch. I just want sports and us channels. These providers don't seem to have a filter system but they have a m3u file. Can I mod a file on my own make a shared link on dropbox then load that link in my perfect player with my exact channels.
Yes, you can modify, but I don't know a program to do that for you. You can edit it like a normal plain text in your favorite editor. Learn about M3U structure and do it yourself! Good luck.