Iirc, APE starts with a (Windows) PE header, which is also a valid shebang-less shell script; when invoked on Unix, the shell script replaces the beginning of t

Iirc, APE starts with a (Windows) PE header, which is also a valid shebang-less shell script; when invoked on Unix, the shell script replaces the beginning of the file with an ELF/Mach-O header and invokes itself.