The configuration menu for Mount & Blade: Warband won't open. I've seen the exact same problem on other distro's. It's usually fixed by installing some missing libraries, but they are not available on Solus AFAIK.

On the list of "Working Steam Games", you can find the following comment about the configuration menu:

Game itself works fine, but config launcher still complains about libaudio (this happens with both Steam, and Native runtimes)

If I run "steam/steamapps/common/MountBlade Warband/mbw_config_linux" in terminal I get this error:

steam/steamapps/common/MountBlade Warband/mbw_config_linux: error while loading shared libraries: libsteam_api.so: cannot open shared object file: No such file or directory

If you DuckDuckGo the issue, most of the results consist of installing these missing libraries:

• libqt4-gui:i386
• libaudio2:i386
• libglib2.0-0:i386 (is in repo)
• libpng12-0:i386 (is in repo)
• libfreetype6:i386 (is in repo)
• libxi6:i386 (is in repo)
• libxrender1:i386 (is in repo)

https://steamcommunity.com/app/48700/discussions/0/617319461013569268/