.m3u

M3U playlist, the plain-text audio playlist format; the m3u8 variant uses UTF-8 for HTTP streaming

Dedicated renderer

Format facts

MIME type: application/vnd.apple.mpegurl
Apple UTI: public.mpeg-url
Stock Quick Look: shown as plain text
Planned approach (census): syntax-highlight
Icon hint: generic-icon
Prevalence: universal

Renderer note (from the census)

pure Go trivial, list file paths

Gotchas: often contains remote URLs