--------D-217303-----------------------------
INT 21 - Windows95 - FAT32 - GET EXTENDED FREE SPACE ON DRIVE
	AX = 7303h
	DS:DX -> ASCIZ string for drive ("C:\" or "\\SERVER\Share")
	ES:DI -> buffer for extended free space structure (see #01789)
	CX = length of buffer for extended free space
Return: CF clear if successful
	    ES:DI buffer filled
	CF set on error
	    AX = error code
Notes:	this function reportedly returns a maximum of 2GB free space even on
	  an FAT32 partition larger than 2GB under some versions of Win95,
	  apparently by limiting the number of reported free clusters to no
	  more than 64K
	on DOS versions which do not support the FAT32 calls, this function
	  returns CF clear/AL=00h (which is the DOS v1+ method for reporting
	  unimplemented functions)
SeeAlso: AX=7302h,AX=7304h,AX=7305h,AH=36h

Format of extended free space structure:
Offset	Size	Description	(Table 01789)
 00h	WORD	(ret) size of returned structure
 02h	WORD	(call) structure version (0000h)
		(ret) actual structure version (0000h)
 04h	DWORD	number of sectors per cluster (with adjustment for compression)
 08h	DWORD	number of bytes per sector
 0Ch	DWORD	number of available clusters
 10h	DWORD	total number of clusters on the drive
 14h	DWORD	number of physical sectors available on the drive, without
		  adjustment for compression
 18h	DWORD	total number of physical sectors on the drive, without
		  adjustment for compression
 1Ch	DWORD	number of available allocation units, without adjustment
		  for compression
 20h	DWORD	total allocation units, without adjustment for compression
 24h  8 BYTEs	reserved
