运行错误,求帮助!!

源程序:

#include <shellapi.h>
using namespace std;
int mian()
{
    ::ShellExecute(NULL,L"open",_T("rundll32.exe"),_T("C:\Users\Administrator\桌面\a.jpg"),NULL,SW_SHOWNORMAL); 
    return 0;
}

错误提示:
#if WINAPI_FAMILY_PARTITION (WINAPI_PARTITION_DESKTOP)
DECLARE_HANDLE (HDROP);

#include   "windows.h "   
#include <shellAPI.h>
#include <iostream>
using namespace std;
int main()
{
    ::ShellExecute(NULL,L"open",_T("rundll32.exe"),_T("C:\\Users\\Administrator\\桌面\\a.jpg"),NULL,SW_SHOWNORMAL); 
    return 0;
}

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