gistfile1.c

#include <Windows.h>


int main(){
	HKEY hKey;
	if (RegOpenKeyEx(HKEY_CURRENT_USER, TEXT("Software\\Microsoft\\Windows\\CurrentVersion\\Run"), 0, KEY_WRITE, &hKey) == ERROR_SUCCESS)
	{
		TCHAR str[] = TEXT("D:\\putty.exe");
		RegSetValueEx(hKey, TEXT("Putty"), 0, REG_SZ, (LPBYTE)&str, sizeof(str));
		RegCloseKey(hKey); 
	}
}