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Re:ACM Software System Award Given to seL4 Microkernel by jonpalmisc on Saturday May 06, 2023 @04:54PM (#35845280)
It’s the executable file format for macOS/iOS/*OS, analogous to ELF or PE.

https://en.m.wikipedia.org/wiki/Mach-O

Re:ACM Software System Award Given to seL4 Microkernel by flangola7 on Monday May 08, 2023 @02:38PM (#35865376)
Oh so an .exe