INT 2F - Windows95 - FIND SFT ENTRY IN INTERNAL FILE TABLES

	AX = 1230h
	ES:DI -> SFT entry
Return: CF clear if SFT found in internal table
	CF set if SFT not in any internal file table
	    AX = 0000h
	    SI:CX = 32-bit starting cluster number for directory
	    DX = directory entry number
	    BX = index into new file system table
Notes:	the new file system table from which the return values are taken is
	  reported to be statically allocated with 20 entries, and used only
	  for FCB calls
	this function is not supported by DR-DOS 7.03 or earlier, by S/DOS 1.0,
	  or by PTS-DOS 6.51
BUG:	Win95-OSR2 is reported to have a bug that can potentially corrupt
	  memory if SFT tables are "arranged poorly"
SeeAlso: AX=1231h,AX=1200h