1877 Preferred Executable Format PEF Aggregate The Preferred Executable Format is a file format that specifies the format of executable files and other object code for the Apple Macintosh. Files of this type may lack a format extension. 224 Datable / Datable 17 Jul 2017 17 Jul 2017 com.apple.pef-binary Apple Uniform Type Identifier fmt/1070 PUID 1448 Preferred Executable Format BOF: Joy!peff https://web.archive.org/web/20020219190852/http://developer.apple.com:80/techpubs/mac/runtimehtml/RTArch-91.html#HEADING=91-0 1 Absolute from BOF 0 0 4A6F792170656666