Hi Martin,

> Sorry I must have been confused. I was now able to open the .ai line drawing
> and I can see a wonderful clean layer structure! Thank you!!

Great!


> But I have to ignore the linked PNG file. When I try to open both ai and PNG it just doesn't open.

You should only open the .ai file - the PNG is already inserted into the .ai file as linked placed art, so it should be in place already right when you open up the .ai file only. But you do need to have the PNG file placed in the same folder alongside the .ai file so that Illustrator is able to find it.

- Michael