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Hi,
AutoCAD 2005 was the first version with a .NET API, and was it almost experimental, try to get some newer version, as the API has changed extensively since 2005, and the tubes for that radio are very hard to find. Any way I don't see how to set .NET Framework 1.0 as the terget of a project in VS 2010 so I think you will need some older VS version in order to work with .NET 1.0.
Gaston Nunez
Ancient versions of AutoCAD's managed API requires an equally-ancient version of Visual Studio (at least 2005 or 2008 but I'm just guessing)