This is by design. The full version of VB 2010 Express only supports up to .sln format 10.0. Convert by hand or use a tool like slnConvert .
Typical use cases
: Includes the Project Explorer for managing files and the Properties Window for customizing buttons, labels, and text boxes. Getting the "Full Version" Microsoft Visual Basic 2010 Express -Full Version-
Before 2005, aspiring developers often had to rely on limited trial versions of the expensive Visual Studio Professional suite or resort to outdated languages. Microsoft addressed this by launching the Express editions—stripped-down but highly capable versions of Visual Studio. This is by design
Installation and requirements (typical)
Double-click "Save" and write:
: The installer will download and install the required files. Restart your computer if prompted. Registration & Full Version Activation Typical use cases : Includes the Project Explorer