Use the RECFMT command to indicate the format of a record oriented file, typically either Fixed or Variable. If the file being sent does not have a record structure, then this command is not meaningful.
The RECFMT statement must come after a FILE command and should preceed any DATA commands.

The syntax is
  RECFMT     record format  

where
record format   is the record format designator
(typically "F" or "V")