From my little venture into this (ok, googling) it would seem that Dominion Wars doesn't use the same format, so it has a built in tool to "import" designs.
I've looked in the file, it's the usual binary blob thing.
It starts out with a crew description, with stats, and the rest is all binary, no patterns.
Except for this one:
EGSUV\TUMMGDB60 this looks like a resource reference of some sort.
When I said no patterns, I meant no readable patterns, such as the one above.
There are some patterns in the binary data that seem to suggest textures (bitmaps), but not more than that, just suggestions.