I've got the MOS Editor working too, yippee clap paws and bounce around. I was going to reinstall XP on another drive for this, but no more!
To get the thing going you need:–
NET Framework 2.0 ... yes, W10 has .NET 4.x built in, but the earlier versions need to be toggled in Turn Windows features on or off
DirectX 9.0c June 2010 version (from Microsoft)
Managed DirectX (in the SOH Library)