Function 13h (19)        Delete File, Using FCBs

    Deletes all files in the current directory that match the filename
    specified in the FCB.

       On entry:      AH         13h
                      DS:DX      Pointer to an unopened FCB

       Returns:       AL         00h       If file deleted
                                 FFh       If file not found

       Network:       Requires Create access rights

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       Notes:         The '?' wildcard character can be included in the
                      file specification; compare this to the delete
                      function using file handles (Function 41h), which
                      does not allow any wildcard characters.

                      Read-only files will not be deleted by this
                      function.

                      Close all open files before deleting them.