Apparently the specs were pulled out, anyway... they're trying to push GenCAM or
ODB++ as a new format. But factories don't use these (here, at least), they want
gencad, cadif or an orcad .max...

I exported a sample board from orcad layout to get the syntax of the missing
section: trivial, in fact... each padstack has a drill hole size and the pad to
use for each layer, there are also 2 zeroes which are maybe a pad offset. I also
found some eagle .ulp script to do the export (gencad.ulp and gencad-2.ulp,
apparenty wrote by the gencad people so more or less autorithative).

Also it seems a guy has the specs available here:

http://www.electronicspoint.com/need-gencad-specification-t153458.html

Monday I'll see if they've got to import the modified format (with the 'fake'
padstacks), otherwise they told me to generate the file in inches (pcbnew output
it in 'user 10000', decimils). We'll see...

BTW orcad also chokes on the arcs used in silk screen... deleting them make it
proceed but hangs anyway.