INT 62 u - FGDRIVER v4.02 - "FG_PCXHEAD" - GET PCX FILE HEADER
	AX = 008Ah
	ES:BX -> variable pointer record (see #03493)
Return: AX = status
	    0000h successful
	    FFFEh not a PCX file
	    FFFFh file does not exist
Note:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
SeeAlso: AX=008Bh,AX=00B9h


Format of FGDRIVER PCXHEAD variable pointer record:
Offset	Size	Description	(Table 03493)
 00h	WORD	segment of 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. filename
 02h	WORD	offset of 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. filename
 04h	WORD	segment of 128-byte buffer for PCX header
 06h	WORD	offset of 128-byte buffer for PCX header