/ekS' ee/ or /eek' See/ or /E-X-E/ An executable binary file. Some operating SyStemS (notably MS-DOS, VMS, and TWENEX) uSe the extenSion .EXE to mark Such fileS. ThiS uSage iS alSo occaSionally found among Unix programmerS even though Unix executableS don' t have any required Suffix. [Jargon File]