.m2t

MPEG-2 Stream

Handled by macOS itself

Format facts

MIME type: video/mp2t
Apple UTI: custom
Stock Quick Look: no stock preview
Planned approach (census): native-sufficient
Icon hint: plays
Prevalence: common

Renderer note (from the census)

macOS plays MPEG-2 TS/PS natively

Gotchas: HDV/DVD/broadcast legacy