.matroska

EBML header chunk, the binary master element starting every Matroska media container

Not a file (scheme/atom)

Format facts

MIME type: application/x-matroska
Apple UTI: custom
Stock Quick Look: no stock preview
Planned approach (census): not-a-file
Icon hint: generic-icon
Prevalence: rare

Renderer note (from the census)

parse EBML header for doc type and version

Gotchas: MKV/WebM base