X4 Appcrash when opening file which previously was fine...

I have a nasty problem: a file I've worked on previously now crashes when I try to open it. I haven't touched it for a couple of months, then everything was fine. Doesn't matter if I open the file or the autobackup, I get:

 

Problem signature:
  Problem Event Name:    APPCRASH
  Application Name:    CorelDRW.exe
  Application Version:    14.0.0.701
  Application Timestamp:    49278263
  Fault Module Name:    StackHash_20ea
  Fault Module Version:    6.1.7600.16385
  Fault Module Timestamp:    4a5bdadb
  Exception Code:    c0000374
  Exception Offset:    000c283b
  OS Version:    6.1.7600.2.0.0.256.1
  Locale ID:    1044
  Additional Information 1:    20ea
  Additional Information 2:    20eaf4da4c882b488dec361e4b7875f5
  Additional Information 3:    9b97
  Additional Information 4:    9b979871724a1847d3a946f3bae2126a

This makes me a bit nervous, as I have hundreds of .cdr files around since it is my preferred tool for designing...anyone got a clue?

I'm running windows 7, the latest x4 patches all in effect, no other probs with Corel, just this file (this far...)