Dolphin browser won't let me change default video player?

In Dolphin I had set "BPS player" to be the default video player when I selected the "Open in other apps" option in the dolphin Player. Now I want to change the default video player again but when I choose "Open in other apps" it just opens the BPS player! I tried to "clear defaults" on both apps but it didn't work. Do I have to uninstall Dolphin or BPS player? Help, searched all over google but didn't find anything.