Cant Open CDR File

Help me please, I have some problem with my coreldraw x4, I'm a logo comercial designer, and some of my customer send me as CDR file for the format design, I always ask my customer to sent me X4 saved cdr , so i can open it. but every time they sent me a cdr file, it always opened blank with the name Graphic1 just like I opened a new blank files. please help me if you have a suggestion