Unity3d System .Management引用问题？

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using UnityEngine;
using System.Collections;
using System .Management;
public class Regedit : MonoBehaviour {
public tk2dTextMesh TestTextMesh;
  // Use this for initialization
void Start () {
  }

// Update is called once per frame
void Update () {

}
}
提示错误：
error CS0234: The type or namespace name `Management' does not exist in the namespace `System'. Are you missing an assembly reference?