1490 Executable and Linkable Format 64bit Big Endian The Executable and Linkable Format (ELF) was developed by Unix System Laboratories and is the standard binary format for executables, object code, shared libraries and core dumps in Unix and Unix-like systems running x86 architecture. Generally within Unix and Unix-like systems, ELF files generally do not have a format extension, however some ELF files may be found with a .elf or .o extension. 1 Digital Preservation Department / The National Archives 11 Feb 2015 11 Feb 2015 fmt/691 PUID elf File extension o File extension 1018 ELF 64bit MSB Magic (.ELF) Architecture (01=32bit, 02=64bit) Endianness (01=Little Endian (Least significant byte order) 02=Big Endian (Most significant byte order)) Version (01=format version 1) 1 Absolute from BOF 0 0 7F454C46020201