copy /b romname.3d0 + romname.3d1 romname.3dz
Get 7zip, it's free. WinRAR is shitty shareware that pops up an annoying message every time you want to extract a file.
Get a crack and WinRAR will never do any such thing. And if you're downloading 3DS games, I doubt you're adverse to cracking shareware. But in any event, it blows 7zip out the water.
It's fast, and it extracts and compresses every format I ever need to use with it.
Or on Linux, OSX, and other unix-like systems:
Code:cat romname.3d0 romname.3d1 > romname.3dz
Echo off
cls
copy /b "%1" + "%2" joined.3ds
pause
Get a crack and WinRAR will never do any such thing. And if you're downloading 3DS games, I doubt you're adverse to cracking shareware. But in any event, it blows 7zip out the water.
7zip is way superior to WinRAR in features, look, and functionality.