How do you plan to deal with it in CorelDRAW? You can't sep it there.
Do you know for a fact that it even opens in PS?
If so, perhaps, someone can open it in Photoshop and see if it's in channels in which case, I think that each channel could be saved as it's own file which may import without crashing. That's how I often output my PS stuff.
I can't promise that I have the time or skill to work on it, but I can try to open it and at least assess it a bit. Send it on over