The OpenSpirit .NET API is based on .NET 2.0 and may be used by both 32 and 64 bit applications written in any language that binds to .NET (e.g. C#, managed C++, VB.NET, Delphi, etc...).

The OpenSpirit SDK comes with an example  Winforms C# application that illustrates the use of the .NET API services. 

The .NET API documentation may be found here ( a 3.8 MByte .chm file - Note that you must right click the downloaded file and change it to "unblock" before it can be used...)