Advice on streaming old games

I'm trying to record and stream Arcanum: Of Steamworks and Magick Obscura. Am using OBS which works very well on new games but with Arcanum I can capture audio but no video. One of the work arounds is to try running a game in windowed mode. However I've not found a way to force Arcanum to do that. Alt Enter doesn't work nor does adding - w or - window to the target in the icon. Any advice?

Did you already try these instructions?

LeapingGnome wrote:

Did you already try these instructions?

Sadly no. Maybe it's because I'm running windows 10?

Maybe I should try Planescape: Torment insted.