Execs can be stored as members in the VSAM-based REXX File System
(RFS), provided with REXX/CICS, or in VSE librarian members with a
member type of PROC.
Note: If
the file identifier you specified for invoking an exec does not include
a file type extension, then only RFS file identifiers with a file
type of EXEC are searched when you attempt to locate and issue the
REXX exec. If the file identifier includes a file type extension,
then only RFS files with a matching file type are searched (when you
attempt to locate and run the exec).