[...] I’m only slightly ahead of myself here. Before making that particular mistake, I had generated an Excellon drill file out of EAGLE and took it to Joel’s house. DanCAM’s optimizer/translater didn’t like the format, so I compared it to another file I had drilled previously and hand-edited it into the same format. (This is on DOS using EDIT, mind you, because that’s what DanCAM wants to run under.) I think I’ve figured out how to make EAGLE generate DanCAMmable files directly, and I’ve written up the information on my EAGLE Circuit/PCB Layout Tips page. [...]