I re-installed MC15, file associations were able to be switched to it.
I un-installed MC 16 and re-installed it.
Within MC 16, I checked every audio and video file association to be opened with MC 16.
I went back into MC 15 and the file associations were now turned off.
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However, when in a Windows folder, when I select a video file and click 'play' MC 15 opens up and plays the file.
In Windows, I select the file's properties and try to change the file association to MC 16.
It shows two icons for MC, no version listed.
I try both but both are for MC 15.
I went to 'other' and find a bigger icon for MC, no version listed and select it.
Now the file association switches to this one the icon changes not to the 'big' icon but instead gets smaller on a white background.
Instead of 'play' as an option, it shows 'open'.
The same thing happens when I browse for the program and
select Program Files (x86)/J River/Media Center 16/Media Center 16.exe.
When 'open' is selected MC 16 launches but the file will not play.
Changing the file association to other programs, VLC, WMC, MC classic works as it should and the file will open in corresponding program.
I've cleaned the Windows Registry with Glary Utilities between the uninstalls/re installs.
Don't know what else to do...
Thank you for your help