With the new Windows 7 upgrade of the .Net Framework to 4.5.1, the plaform builder does not build properly and throws out the error,
fatal error ! Microsoft.NET Framework v4.x must be installed on your machine
Until Microsoft comes up with a fix, following 2 steps is the simple workaround, thank you to Claus for pointing out the workaround
1. First open the file sources.ce in the path C:\WINCE800\public\common\oak\misc.
At the top of the file, set the environment variable at the installation path of .Net Framework as
_DOTNET40ROOT=C:\Windows\Microsoft.NET\Framework\v4.0.30319
2. Go to windows Control Panel, then select System. In the System window, select Advanced System Settings. In the System Properties window, select the Advanced tab.
Click on the Environment Variables button, and edit Path variable.
Carefully modify the Variable value as above C:\Windows\Microsoft.NET\Framework\v4.0.30319