Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide

/EXECUTABLE

Use /EXEC to identify the output file as an executable program (.EXE file). The linker generates .EXE files by default.

If you specify /EXEC with /DLL, only the last specified of the options takes effect.

If you do not specify /EXEC or /DLL, then by default the linker produces an .EXE file.

Default: /EXECUTABLE

Abbreviation: /EXEC

Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide