The imported project “C:\Microsoft.CSharp.targets” was not found

Question

I got this error today when trying to open a Visual Studio 2008 project in Visual Studio 2005:

The imported project \"C:\\Microsoft.C

Answer 1

This error can also occur when opening a Silverlight project that was built in SL 4, while you have SL 5 installed.

Here is an example error message: The imported project "C:\Program Files (x86)\MSBuild\Microsoft\Silverlight\v4.0\Microsoft.Silverlight.CSharp.targets" was not found.

Note the v4.0.

To resolve, edit the project and find:

v4.0

And change it to v5.0.

Then reload project and it will open (unless you do not have SL 5 installed).