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The vc9, vc10, vc11 (and may be vc11_ui) folders are corresponding to different versions of OpenCV libraries which are built with Visual C++ 2008 (vc9), VC++ 2010 (vc10) and VC++ 2012 (vc11 and vc11_ui). And the mingw folder contains library's files built with g++ in mingw. These versions are for different developpers and systems because a program compiled in VC++ 2013 can not link to .lib files generated by VC++ 2012 (or 2010, .etc). I do not think there is an agreement between MS and mingw.