@echo off
setlocal enabledelayedexpansion
type nul>"C:\test\2.txt"
for /f "usebackq tokens=1-8 delims=. " %%a in ("C:\test\1.txt") do (
set /a a=1%%a%%1000
set /a b=1%%b%%1000
set /a c=1%%c%%1000
set /a d=1%%d%%1000
set /a e=1%%e%%1000
set /a f=1%%f%%1000
set /a g=1%%g%%1000
set /a h=1%%h%%1000
>>"C:\test\2.txt" echo !a!.!b!.!c!.!d! !e!.!f!.!g!.!h!
)