.ora

OpenRaster layered raster image file, opened by Krita, GIMP and MyPaint

Dedicated renderer

Format facts

MIME type: image/openraster
Apple UTI: custom
Stock Quick Look: a ZIP-based container
Planned approach (census): special-renderer
Icon hint: generic-icon
Prevalence: niche

Renderer note (from the census)

parse ZIP for mergedimage.png

Gotchas: open standard for layered images