Needs specs to build Lingvo dictionaries

Hello there

So I made a big XDXF from dictionary.com.
And then I wanted to convert it to the PocketBook format, which I believe is the ABBYY Lingvo format, using the tool that is right there

But... my 540 mb XDXF is too big and the tool seems to crash :p
You can check how I did it over there.

So I'm thinking about coding a new converter myself.

And what I need are the Lingvo format specs.
Anybody has technical knowledge about that?

Cheers guy