Assigning newline character to a variable in a batch script

Question

Hi, The following is the batch script i have written

@echo off
setlocal enabledelayedexpansion
set finalcontent=
For /F "tokens=1-2* delims=  " %%I in (abc.txt) do (
IF %%J EQU MAJORVER (
set currentline=%%I %%J %1
set finalcontent=!finalcontent!!currentline!
) ELSE IF %%J EQU MINORVER (
set currentline=%%I %%J %2
set finalcontent=!finalcontent!!currentline!
) ELSE IF %%J EQU BUILDNUM (
set currentline=%%I %%J %3
set finalcontent=!finalcontent!!currentline!
) ELSE (
set currentline=%%I %%J %%K%NL%
set finalcontent=!finalcontent!!currentline!
)
)
echo %finalcontent%>>xyz.txt

I want a newline character appended at the end of every occurence of the variable currentline. Can anyone guide me on this?