How do I get rid of this error, I am using Visual Studio 2008 because 2010 wouldn’t open some of my VB Projects.
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A VS2008 project file starts out with
where the ToolsVersion indicates the .net framework tools version. VS2010 uses .net 4, so clearly has made the corresponding change in its tools version.
I would expect that opening your project files in Notepad and resetting the tools version to 3.5 will clear that issue. Whether there are other backwards incompatibilities lurking, I couldn’t say.