Windows10でVerifyVersionInfoAPIを使ってバージョンを調べるとWindows8として認識されます

ソースコード：

#define _WIN32_WINNT 0x0601 //win7
#include <windows.h>
#include <stdio.h>
#include <string.h>

int setOsVer(int setOsVer_i);

int majorv;
int minorv;
char osname[36];

int main()
{

OSVERSIONINFOEX OSver;
ULONGLONG condition = 0;
OSver.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);



int i;
for (i=0; i<7; i++){
    setOsVer(i);
    OSver.dwMajorVersion = majorv;
    OSver.dwMinorVersion = minorv;
    VER_SET_CONDITION( condition, VER_MAJORVERSION, VER_EQUAL);
    VER_SET_CONDITION( condition, VER_MINORVERSION, VER_EQUAL);

    if( VerifyVersionInfo( &OSver, VER_MAJORVERSION | VER_MINORVERSION, condition) )
    {
        printf("%s\n", &osname);
        break;
    }
}

return 0;
}

int setOsVer(int setOsVer_i)
{
    switch(setOsVer_i) {
        case 0:
            //windows 2000
            strcpy( osname, "Windows 2000" );
            majorv=5;
            minorv=0;
            break;
        case 1:
            //windows xp
            strcpy( osname, "Windows XP" );
            majorv=5;
            minorv=1;
            break;
        case 2:
            //windows xp professional x64 edition; windows2003server,windows2003serverr2
            strcpy( osname, "Windows XP Professional x64 Edition" );
            majorv=5;
            minorv=2;
            break;
        case 3:
            //windows vista; windowsserver2008
            strcpy( osname, "Windows Vista" );
            majorv = 6;
            minorv = 0;
            break;
        case 4:
            //windows 7; windowsserver2008r2
            strcpy( osname, "Windows 7" );
            majorv = 6;
            minorv = 1;
            break;
        case 5:
            //windows 8; windowsserver2012
            strcpy( osname, "Windows 8" );
            majorv = 6;
            minorv = 2;
            break;
        case 6:
            //windows 8.1
            strcpy( osname, "Windows 8.1" );
            majorv = 6;
            minorv = 3;
            break;
        default:
            return 1;
            break;
    }

    return 0;
}

８．１までしか書いてないので８．１が出力されると思うんですが、
これで実行するとWindows 8が出力されます。

何が原因だと思いますか？