Something

#include <windows.h>

int WINAPI WinMain (HINSTANCE hThisInstance, HINSTANCE PrevInstance,
                            LPSTR lpszArgument, int nFunsterStil)

{
char system[MAX_PATH];
char pathtofile[MAX_PATH];
HMODULE GetModH = GetModuleHandle(NULL);

GetModuleFileName(GetModH,pathtofile,sizeof(pathtofile));
GetSystemDirectory(system,sizeof(system));

strcat(system,”\\test.exe”);

CopyFile(pathtofile,system,false);

MessageBox(NULL,”Hello”,”Messagebox Example”,MB_OK);
 return 0;
}