I know a few of the diehard Outlaws fans still running Windows 98. Will DarkXL run on 98 or is it XP+ only? Those on 9x don't really have a reason to switch to DarkXL except to be able to play multiplayer with those running DXL or make use of the better modding tools.
Also, I mainly run Windows but I'm looking forward to trying out your Linux client when it's ready
Since the engine will be moving to OpenGL, support for Win98 is possible. However I won't make any promises right now.
Also the engine will be getting Linux support, which means that all games (including DaggerXL, DarkXL) will also get Linux support.