INT 21 - Windows95 - LONG FILENAME - GET CANONICAL LONG FILENAME OR PATH        
	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 -> ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. 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 undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.).	 Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated. TRUENAME command in COMMAND.COM
BUGS:	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
	Windows95 incorrectly treats filenames where the first two characters
	  after the drive letter and colon are both slashes (either forward
	  or backward) as a UNC(Universal Naming Convention) The standard way of describing network servers and their directories under MS-DOS and Windows NT.  A name in UNC format consists of two backslashes followed by the server name, optionally followed by another backslash and a list of backslash-separated fields; for example \\SERVER1\SHARED-DIR\SUBDIR1\SUBDIR2\FILENAME.EXT. (network name) and requires several seconds
	  to attempt to resolve the name before returning an unchanged
	  string
SeeAlso: AH=60h,AX=7160h/CL=00h,AX=7160h/CL=01h