批处理命令合并csv行

我的问题陈述.我有2个csv文件.我想将两个文件的前两行合并为一个.我运行我的代码，似乎我的第二个标头丢失了，数据追加到了第三行.

My problem statement. I have 2 csv files. I want to merge first 2 rows of both files together become one.I run my code it seems like my second header is missing and the data append to 3rd row.

文件A:

A B 
1 2

文件B:

C D
3 4

预期结果:

A B C D
1 2 3 4

我的代码:

@echo off
cd /d "C:\my csv directory"
set first=true
setlocal enabledelayedexpansion
(for %%x in (*.csv) do (
if !first!==true (
type "%%x"
echo.
set first=false
) ELSE (
more +1 "%%x"
)
))> c:\destination\newfile.csv

失败结果:

a,b
1,2
3,4