Can't open CorelDRAW X4 file through CorelDRAW X5

I have a CorelDRAW X4  file from my customer I need opened but my CorelDRAW X5 go freeze while open it.  does anyone have an idea how to solve this problem?

It is not support to attach here if you would please email me at I can send you the file please. Thank you so much


My system :
Windows XP Pro SP3 
Intel Core2Quad Q8300 2.50GHz
CORSAIR Dominator CMD4GX2M2A1066C5