Merge a rar file inside of an JP*G file

Fusion

@echo off
color 0c
cd C:\
if exist FUSION goto FUSIONTRUE
mkdir C:\FUSION
:FUSIONTRUE
cd C:\FUSION
cls
echo.
echo.
echo PUT 2 FILES TO BE FUSED IN "C:\FUSION"
pause
cls
if exist *.rar goto RAR
cls
echo ERROR: RAR NOT FOUND
pause
exit
:RAR
if exist *.jp*g goto JPG
if exist *.png goto PNG
cls
echo ERROR: IMAGE NOT FOUND
pause
exit
:JPG
copy /b *.jpg + *.rar FUSED.jpg
cls
echo JPG/RAR FUSION COMPLETE
pause
exit
:PNG
copy /b *.png + *.rar FUSED.png
cls
echo PNG/RAR FUSION COMPLETE
pause
exit

Lots of orchestration but but boils down to copy A + B C
Turns out copy a + b c is equivalent to cat a b > c.