CorelDRAW X4 File Won't Open at all

I Created 28 page Booklet style Document over a period of a week. All the time working and saving. When returning to document, it now does not open, neither does the back-up. No warnings, messages, nothing. Just won't open, creates & goes to "Graphics1" file instead. Calls to so called Corel Tech Support resulted in emailed "Recovering Lost Documents" Guidelines which essentially state "better have a back-up". The phone conversation and subsequent email suggest  "we don't care".

I only have experience with Adobe Tech Support  so this is what I'm using as a standard. No comparison in level of help. First hand experience in 2 separate issues with Corel tells me if you have a problem , you're on your own.

Now that we've lost all that work and now must recreate it, I'm thinking, certainly not on Corel after this.

Anyone have any similar experience or suggestions?

I seriously suggest that Corel look at its Customer Service.