Format of FGDRIVER PCXPAL variable pointer record:
Offset	Size	Description	)
 00h	WORD	segment of ASCIZ .PCX filename
 02h	WORD	offset of ASCIZ .PCX filename
 04h	WORD	segment of buffer for .PCX palette RGB triples
 06h	WORD	offset of buffer for .PCX palette RGB triples
Note:	the buffer for the palette must hold at least three times as many bytes
	  as there are colors in the palette
SeeAlso: #03495