With Filestar you can easily convert DPX to TGA. Accessible directly in your right click menu for single or batch DPX processing. How to convert DPX to TGA:
1. Download and install the latest version of Filestar. (https://filestar.com)
2. Right click on one or more DPX file(s) on your desktop and select Convert with Filestar.
Type "convert tga" in the search box.
3. Press Run.