I have troubles with the generated .gcd file sent to manufacturing (to do flying
probe testing). The factory people says that it 'doesn't load'. While waiting
for additional info about the problem, are there some docs on that format?

I tried to give the .gcd to eat to an old orcad layout 9... it chokes on the
line end (it wants CRLF, maybe it's the problem with the factory); fixing that
requires a '$PADSTACKS' section and giving it a 'trivial' padstack definition
(every pad type as a padstack on each layer) hangs with 100% CPU... maybe it's
Layout that sucks, maybe it's the gcd file...

Anybody has experience with that format?