.psd

Adobe Photoshop

Handled by macOS itself

Format facts

MIME type: image/vnd.adobe.photoshop
Apple UTI: com.adobe.photoshop-image
Stock Quick Look: macOS renders a preview
Planned approach (census): native-sufficient
Icon hint: unknown
Prevalence: universal

Renderer note (from the census)

macOS ImageIO renders the flattened composite natively

Gotchas: huge files, pure Go PSD reader exists