The best way to handle CDR format, including cdr to jpg conversion (Corel to JPEG export), would be to use CorelDRAW from which the format originates. In case you do not have CorelDraw! installed for an one-time conversion, there is always the option to download the trial version.
Support for CDR format in 3rd party programs is limited, however some older version of the format can be opened / exported in certain graphics editors.