This version upgrades Tidepass .NET to target .NET 4.0 and adds a lot of performance improvements.
You will need .NET 4.0 installed before you can run it. You can get this by installing the Visual Studio 2010 RC or wait until April 12th when the final is released.
I now consider Tidepass .NET to be the best version to run on Windows (I have moved to this version from the Java version myself).