How in the world did the file get that big? The only thing that could possibly explain it is embedded images.
That is a very dangerous way to work and you’re now finding out why.
Bob, don't be a scold.
If you have any thoughts on my original question I would like to read them.
I just gave them to you.
That file is likely to be corrupt.
I had thought it might be.
I preserved my original (created in CS5) and saved a copy
to try it in CC 2014. The copy wouldn't open in CC.
I deleted this copy and tried again with a new copy
Tried to open in CC - no go.
Opened the new copy in CS5 - no problem.
If the file were corrupt, would it still open in CS5, or is this
a forward compatibility issue?
I’ve seen several reports like this. You need to unembed those images and link them properly.
After that, do a file save as to get rid of as much junk in the file as possible.
ARE the images embedded (or worse, pasted in)?
Does the IDML file open in CS5?