.numbers-tef

Apple Numbers TEF

Handled by macOS itself

Format facts

MIME type: application/x-iwork-numbers-sffnumbers
Apple UTI: com.apple.iwork.numbers.sffnumbers
Stock Quick Look: a ZIP-based container
Planned approach (census): native-sufficient
Icon hint: renders
Prevalence: rare

Renderer note (from the census)

macOS handles natively

Gotchas: telemetry variant