Is there a .rm plugin for Dopus? I have some old videos saved in that format and I would prefer to have the d8 viewer handle all video files if possible.
If you can find codecs and splitters that make them play in Windows Media Player, they'll also work in Opus (one way or another... if they are 32-bit only then you'd need to route them via the ActiveX plugin).
Focus on getting WMP to work and if you can get there there is easy, and may even be automatic.
Try "K-Lite Basic", not overloaded, stable (using over years in uncountable PC's) and supports nearly all formats.