Unity AssetDatabase.RenameAsset(path, newName); can not rename extension CSharpReNameFileNameExtention_And_Meta(string path,string newName) can chenge extension

CSharpReNameFileNameExtention_And_Meta.cs

    static public void CSharpReNameFileNameExtention_And_Meta(string path,string newName)
    {
        string[] pathArr = path.Split("/"[0]);
        string tempStr = "";
        for (int i = 0; i < pathArr.Length-1; i++)
        {
            tempStr = tempStr + pathArr[i]+"/";

        }
        string renameDir = tempStr;
        Debug.Log("renameDir="+ renameDir);
        string renameFileAndExtension = pathArr[pathArr.Length - 1];
        Debug.Log("renameFileAndExtension=" + renameFileAndExtension);

        //
        string HDpath = Application.dataPath + renameDir;
        string renameFilePath = HDpath + renameFileAndExtension;
        string renameFilePathMeta = renameFilePath + ".meta";
        string newFilePath = HDpath + newName + "";
        string newFilePathMeta = newFilePath + ".meta";
        /*
        string renameFilePath = Application.dataPath + path;
        string renameFilePathMeta = Application.dataPath + path + ".meta";
        string newFilePath = Application.dataPath + newName + "";
        string newFilePathMeta = Application.dataPath + newName + ".meta";
        */
        Debug.Log("renameFilePath= " + renameFilePath);
        Debug.Log("renameFilePathMeta= " + renameFilePathMeta);
        Debug.Log("newFilePath= " + newFilePath);
        Debug.Log("newFilePathMeta= " + newFilePathMeta);

        if (System.IO.File.Exists(renameFilePathMeta))
        {
            Debug.Log("OK Exist renameFilePathMeta =" + renameFilePathMeta);
        }
        else
        {
            Debug.Log("NG Not Found  renameFilePathMeta =" + renameFilePathMeta);
        }
        if (System.IO.File.Exists(renameFilePath))
        {
            Debug.Log("OK Exist renameFilePath =" + renameFilePath);
        }
        else
        {
            Debug.Log("NG Not Found  renameFilePath =" + renameFilePath);
        }


        //you shuld  first rename metafile  on Unity
        System.IO.File.Move(renameFilePathMeta, newFilePathMeta);
        System.IO.File.Move(renameFilePath, newFilePath);

        if (System.IO.File.Exists(newFilePathMeta))
        {
            Debug.Log("OK Exist newFilePathMeta =" + newFilePathMeta+"  sucsess renamed!! OK");
        }
        else
        {
            Debug.Log("NG Not Found  newFilePathMeta =" + newFilePathMeta + "  rename faild  NG");
        }
        if (System.IO.File.Exists(newFilePath))
        {
            Debug.Log("OK Exist newFilePath =" + newFilePath + "  sucsess renamed!! OK");
        }
        else
        {
            Debug.Log("NG Not Found  newFilePath =" + newFilePath + "  rename faild  NG");
        }

        AssetDatabase.Refresh();
        
    }


    static public void UnityAssetDatabaceRenameFileNameAndExtention(string path,string newName)
    {
        // Rename
        string ret;
        ret = AssetDatabase.RenameAsset(path, newName);
        if (ret == "")
        {
            Debug.Log("Material asset renamed to newName="+ newName);
        }
        else
        { 
            Debug.Log(ret);
        }
        AssetDatabase.Refresh();
    }