 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (February 2021) |
 | |
| Filename extension |
none, .o, .dylib |
|---|---|
| Uniform Type Identifier (UTI) | com.apple.mach-o-binary |
| Developed by | Carnegie Mellon University, Apple Inc. |
| Type of format | Binary, executable, object, shared libraries, core dump |
| Container for | ARM, SPARC, PA-RISC, PowerPC and x86 executable code, memory image dumps |
Mach-O, short for Mach object file format, is a file format for executables, object code, shared libraries, dynamically loaded code, and core dumps. It was developed to replace the a.out format.
Mach-O is used by some systems based on the Mach kernel. NeXTSTEP, macOS, and iOS are examples of systems that use this format for native executables, libraries and object code.