I opened my existing MFC project using Visual Studio and when I build I get the following error message:
Error 1 error MSB8031: Use of MBCS encoding in MFC projects require an additional library to be downloaded and installed. Please see http://go.microsoft.com/fwlink/?LinkId=286820 for more information. C:\Program Files\MSBuild\Microsoft.Cpp\v4.0\v120\Microsoft.CppBuild.targets
What is this about?
This error message is due to the missing MBCS MFC package. Starting with Visual Studio 2013, MBCS portion of the MFC library has been broken out of the Visual Studio product into its own separate download. Installing this package and rebuilding should fix the problem.
Update for Visual Studio 2015
Starting with Visual Studio 2015, the entire MFC C++ library (including the MBCS pieces) is an optional install component. While installing VS2015, if you select C++ and MFC, you will also get the MBCS library.
Instead of installing an add-on, you may consider changing the character set from MBCS to Unicode.
This is done in the project properties as is depicted below.
For Visual Studio 2015:
According to Redistributing the MFC Library article on MSDN, there are no mfc140.dll files in redist directory (c:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\redist\x86).
The mfc140.dll files were omitted from the redistributable files directory in Visual Studio 2015 RTM. You can use the versions installed by Visual Studio 2015 in the Windows\system32 and Windows\syswow64 directories instead.
来源：https://stackoverflow.com/questions/19603680/mbcs-error-building-mfc-c-project-with-visual-studio