The most obvious choice for exporting Corel Presentation files (*.cmx) to common JPEG images would be to use either CorelDraw or any other Corel software that supports CMX format. You could also try some of the image viewing/conversion programs like the XnView/XnConvert that supposedly supports the conversion of CMX to JPEG format.
Convert Corel Presentation exchange file to JPEG bitmap image format.
We found 3 software records in the database related to .cmx to .jpeg file format conversion.
Microsoft Windows software - convert cmx to jpeg on Windows
A dedicated conversion software
Convert from cmx file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned cmx to jpeg. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A set of applications used by professional graphic designers
Multiplatform software - convert cmx to jpeg on any platform
A popular utility for viewing and converting graphic files