Int 21 Fn 7160  - Windows95 - Long Filename - Get Canonical Long Filename  [D]

   AX = 7160h
   CL = 02h
   CH = SUBST expansion flag
       00h return a path containing true path for a SUBSTed drive letter
       80h return a path containing the SUBSTed drive letter
   DS:SI -> ASCIZ short filename or path
   ES:DI -> 261-byte buffer for canonicalized long name

Return: CF set on error
       AX = error code
       02h invalid component in directory path or drive letter only
       03h malformed path or invalid drive letter
       ES:DI buffer unchanged
   CF clear if successful
       ES:DI buffer filled with qualified long name (can contain
         lowercase letters)
Desc:  determine the canonical name of the specified filename or path,
     corresponding to the undocumented TRUENAME command in COMMAND.COM
BUG:   even though the maximum length of a complete long pathname is 260
     characters, Windows95 returns CF set/AX=0003h even if the file
     exists whenever the full pathname is more than 255 characters

See Also: AH=60h,AX=7160h/CL=00h,AX=7160h/CL=01h