Mach-O 64bit

Writable

executable

Mach-O is a standard used to store programs and libraries on disk in the Apple Mac app binary interface. Mach-O files generally lack a format extension.

Identify it

Extensions	`.o.dylib.bundle`
Signatures	`feedfacf` at byte 0 (Mach-O 64 bit 1) `cffaedfe` at byte 0 (Mach-O 64 bit 2) `cefaedfe` at byte 0 `feedface` at byte 0
PRONOM	`fmt/692fmt/693`
Wikidata	`Q2627217`

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Open it

ZigOpen sourcewrites · MIT License
ExifToolOpen sourcereads · Artistic License / GNU General Public License, version 1.0 or later

Convert it

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Documentation

kaitai grammar: https://github.com/kaitai-io/kaitai_struct_formats/blob/master/executable/mach_o.ksy

Versions and variants (1)

Mach-O 32bitPartly documented

Sources

From Just Solve the File Format Problem (File Formats Wiki), Kaitai Struct format gallery, PRONOM, Wikidata. Updated 2026-10-24.

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