I just installed Registrator Viewer to test it.
It played both the 1080 and 1440 files with no problem, however as expected no GPS or G-Sensor data was displayed.
Back to Dashcam Viewer. It works flawlessly for me, and even displays the correct MPH speed, even though the speed contained in the GPS data in the video is in KPH as opposed to MPH.
RodeoGeorge