Unable to open m3u with default application

[rrittwikc]

I am using latest Manjaro i3wm and downloaded handlr binary from releases section of this repo.

In terminal if I run
handlr launch .m3u pl.m3u
it is opening mpv and playing the playlist as expected.

But if I run
handlr open pl.m3u
it is opening emacs (my default editor) and showing the song list.

file pl.m3u gives ASCII text, whereas mimetype pl.m3u gives audio/x-mpegurl.

handlr get .m3u gives mpv.desktop.