I have been using CorelDRAW X4 during some years. But only first time I saw Error reading a Corel3.cdr file. I've no idea what to undertake. I cannot continue my work in editor. I only wait someone or something that could aid me to solve it.
If it is a Corel 3 (not Corel X3) file then there is a good chance that X4 cannot read the file.Another option is that there are objects in the file that got corrupted or are not properly recognized by Corel (e.g. because the file contains elements imported from another file). Is this a file you received from someone else or a file you created yourself in the past?