Hi guys. I experienced the same issue and found out that the best solution (at least for now) is to install Rune Gold and tweak it with Direct3D 10 support files + RuneHOV or Widescreen.
You can find everything in detail on this webpage: http://pcgamingwiki.com/wiki/Rune
- Look for the "Essential improvements" section and "Widescreen resolution" under "Video settings" where you can find link to http://www.wsgf.org/dr/rune
which has that widescreen support.
After that I see that the game runs much much better with occasional graphical glitches, but those are minority. It also depends on what setting you prefer in game when you hit "Advanced Options" under "Game" tab. There you can find "Rendering" section and choose whatever suits you. You have to play with that a bit to have some results. For example I have mine set like in the attachment I uploaded.
Beware that Save on Classic is NOT working under Gold, which means that either you have to play from scratch OR do it like myself -> Start a new game with difficulty you want and then enable cheats and open a map where you were the last time + summon items you were wearing before.
I hope this helped a bit :)