If you have both CorelDraw Graphics Suite X5 and CDGS X6 installed, it is recommended to have X6 shell
extension. In Windows Control Panel, check to see which shell extension is installed.
If you do not see the version 16 shell extension, you may need to install it or do Repair from the DVD. See this knowledge base article.
If you have version 16 then do this...
1. Right click any cdr file and click properties.
2. Under General Tab, click Change button...
3. In the new dialog that opens up, you'll see all CorelDRAW program icons
(depending on CDGS versions you have installed). Select X6 CorelDRAW
version. Click OK and close all dialog boxes.