Sony DVI-HDTV Strange connector
 

I'm trying to setup a HTPC for my parents who have a
Sony KP-51WS500 HD television. The tv has a
DVI input, but it does not look like a completely
standard DVI plug. The description is relayed from
my dad over the phone, but apparently the plug looks like:

3 rows of standard DVI pins as in DVI-I dual link,
then 2 stacked vertical slots (we think they are dummy inactive plugs),
then a horizontal slot.

He insists it doesn't look like the standard DVI-I, DVI-D, or
even DVI-A plug, tho its possible one of them might fit.

Qestion is does anyone know more information about this plug,
and then how if anyway can it be used from a standard
PC video card with both VGA and DVI-I outputs?

The fallback is to use a component input but all are currently
used, plus its more expensive to buy a vga-component converter;
I've done this on my HDTV so I'm familiar with this approach.

Many thanks to who ever can help me out.