I tried the power dvd 12 as the preview player for bitcomet when i was ask to select a player for the first time but the Power dvd 12 does not support the file while you are downloading it..it doesn’t play..So I wanted to change to another playe like K-lite codec pack or Media Player classic, which can play most of the video file out there.But the problem is, there is no option to change it and i hope that the next release of Bitcomet,they will add the feature to change the preview player..Thanks
Options → Advanced → ui.preview_program_path
Change it to point to your preferred viewer.
Try the freeware VLC player from videolan.org.