如何将Visual Studio .NET 2008解决方案转换为Visual Studio .NET 2005？

Assume that a solution only contains classes and that those classes are all written to .NET 2.0 specifications. If that solution were to be opened, converted and saved in Visual Studio 2008, would it be possible to reopen the solution later in Visual Studio 2005 with some minimal modifications to the .SLN file?Assume that a solution only contains classes an