The default filename for the File Handler configuration file is
extfh.cfg but you can use a different filename by setting the EXTFH environment variable. For example:
set EXTFH=c:\mydir\test.cfg
sets the filename to
c:\mydir\test.cfg.
Format of the Configuration File The File Handler configuration file enables you to apply settings to individual or groups of files by adding options to different
sections in the file.
Configuration File Options The File Handler configuration file can contain a number of options that affect file handling operations in this COBOL system.