title: An issue with different platform toolset
body: <p>There is a DLL written in C++ and built with th <strong>v90 Platform Toolset</strong>.
  This DLL should be used as an API in the managed C++ project based on .NETFramework 4.0 where the Platform Toolset is <strong>v100</strong>.
  I can't call any methods from the API unless I downgrade the platform of managed c++ project from <strong>v100</strong> to <strong>v90</strong>.</p>
  
  <p>Please advise whether there is a way to avoid changing the platform and how to perform calls from <strong>v100</strong> platform to <strong>v90</strong>?</p>