How do I...

Hi all
I’m trying to learn and understand VB .NET I have downloaded some sample code to have a play with. When I’m presented with the files and folders I click on the .vbproj (same as VB 6) or the .sln (I have tried both) has instructed in one manual and get the same error message:

An error occurred while loading the document. Fix the error, and try loading the document again. The error message follows:
Invalid ResX input.

What is causing this error?
How can I over come this error?
In the future what file should I click on to open .NET from Windows Explorer?

thanks for your time :)

probably because you are trying load projects written in a beta version with the full release of vice versa.