How the Extract File Is Created and Compiled
In the fifth step, if the application that you are running contains any 3GL procedures, ABF creates an extract file in which it builds a runtime table of such procedures. This file is called:
Windows:
abextract.c 
UNIX:
abextract.c 
VMS:
abextract.mar 
ABF then:
1. Compiles this file into an object file called abextract.obj.
2. Creates a temporary copy of the interpreter by linking this object file with the host language object files and libraries.