It might have to do with the shell extension not being installed, or a corrupt install of it.

If the shell extension is listed in the control panel for uninstalling, uninstall it.

Navigate to your Corel installation folder and install the shell extension and reboot. It is likely in a place like:

C:\Program Files\Corel\CorelDRAW Graphics Suite X7\Setup\CGS17\ShellExt.msi

The above would be for the 64-bit version. I believe for the 32-bit version it would be the above, but located here:

C:\Program Files (x86)\Corel\CorelDRAW Graphics Suite X7\Setup\CGS17\ShellExt.msi

Mike