aloha20200628

针对一楼的简单样本，老老实实用纯P代码解了。
假设源文件是ANSI/简中编码

@echo off
cd /d "D:\Program Files (x86)"
set "newUser=abc" &set "newPw=999"
setlocal enabledelayedexpansion
(for /f "delims=" %%s in (src.ini) do if not defined got (
		(echo,%%s)
		if /i "%%s"=="[SERVER_DATA_2]" (set "got=1")
	) else (
		if !got! equ 1 (set "newV=%newUser%") else (set "newV=%newPw%")
		for /f "tokens=1 delims==" %%1 in ("%%s") do (echo,%%1=!newV!)
		if !got! equ 2 (set "got=") else (set/a got+=1)
	)
)>new.ini
:: move /y new.ini src.ini REM 若保留源文件即注释此行
endlocal &exit/b
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