Int 2F Fn C000  - Fn32 32 Character Filename Utilities - Installation Che  [f]

   AX = C000h

Return: AL = FFh if installed
      ES:DI -> signature string "FN32 32CHAR TSR"
Program: FN32 is a TSR which supports 32 character filenames under PC/MS-DOS

Note:  the TSR intercepts INT 21 calls and performs filename substitution by
     managing dictionary files in each directory which contains long
     filenames