.spx

Speex speech-compressed audio file, decoded by Speex-capable players

Dedicated renderer

Format facts

MIME type: audio/speex
Apple UTI: custom
Stock Quick Look: no stock preview
Planned approach (census): special-renderer
Icon hint: generic-icon
Prevalence: niche

Renderer note (from the census)

parse Ogg Speex header

Gotchas: usually inside ogg container