INT 31 - CauseWay v1.3 - "cwcInfo" - VALIDATE AND GET SIZE OF CWC FILE

	AX = FF2Bh
	BX = file handle for CWC-compressed file
Return: CF clear if successful
	    ECX = expanded file size
	CF set on error (not a CWC-compressed file)
SeeAlso: AX=FF00h,AX=FFFBh