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  Arguments
 
    pathname     String expression representing a full DOS file name
 
    directory    String variable of type DirStr; receives drive and
                 directory, including colon and backslashes
 
    filename     String variable of type NameStr; receives base name
                 of file
 
    extension    String variable of type ExtStr; receives file
                 extension, including dot
 
  Description
 
    The FSplit procedure separates a file name into the component parts
    of drive plus directory, base name, and file extension. The
    returned components contain all the characters passed in pathname.
    FSplit neither adds nor removes characters.
 
    The pathname argument passes a path name for a file. It is of type
    PathStr, defined in DOS.
 
    The output arguments are directory, filename, and extension. Each
    receives a component of pathname. Their types, respectively, are
    DirStr, NameStr, and ExtStr, all defined in the Dos unit.
 
    FSplit sets an output argument to a null string if pathname does
    not contain the corresponding component.
 
    The FExpand function expands a file name to a fully qualified DOS
    path name.