text/microsoft-resx 2.0 System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 If you want to use your existing XNA Contentproject you need to choose the Import option. Also the Import option is required when trying to open files created by the EES Content Compiler 3. Only choose "Open" if you want to open a file that was previously saved by this application.