*CFOPEN, Fname, Ext, --, Loc
Opens a "command" file.
FnameFile name and directory path (248 characters maximum, including the characters needed for the directory path). An unspecified directory path defaults to the working directory; in this case, you can use all 248 characters for the file name.
The file name defaults to Jobname.
ExtFilename extension (eight-character maximum).
The extension defaults to CMD if Fname is
blank.
--Unused field.
LocDetermines whether existing file will be overwritten or appended:
The existing file will be overwritten.
The file will be appended to the existing file.