Just installed latest Strawberry for Windows, and noticed exporting as M3U allowed typing in .m3u8 as extension name when saving.
Huh...
My main reason for posting this in the first place, was cause I seemed to recall that for whatever reason I couldn't type in .m3u8 as extension when exporting in M3U format, in my Ubuntu installation.. Uh, man, I can't really trust my memories these days..
