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     Up to four extensions can be specified, each extension being up to
     10 characters long. An extension of null is used to represent an
     extension of spaces.
 
     If you have many COPY statements that do not specify an extension,
     using COPYEXT can improve the compilation speed of your program.
 
     For example, if all of your COPY-files have the extension .CPY,
     specifying COPYEXT "CPY,CBL" would avoid unnecessary file access
     attempts.
 
     The behavior of this directive is affected by the setting of the
     OSEXT directive. The extension specified by the OSEXT directive
     overrides the first extension specified by the COPYEXT directive.
     For example:
 
       COPYEXT "CPY,CBL,TXT"  OSEXT "SRC"
 
     would have the same effect as:
 
       COPYEXT "SRC,CBL,TXT"
 
     See also ◄OSEXT►
                                    -♦-