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How To Run Multiple Minecraft Jars On Your Pc

Minecraft Updates Tutorials

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#1 DeadShotm1

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Posted 22 May 2012 - 04:41 PM

Have you ever wished that you could play the most recent snapshot, yet still be able to play the official version? Well, with this method you can, and much more. You can play mods that are usually incompatible.

::NOTE:: This tutorial is for Windows. I do not have a Mac, so if anyone wants to post with Mac instructions, feel free to do so!

1) Create a folder named "Minecraft" inside of your C:____\AppData\Roaming directory.
2) Transfer your .minecraft folder into the "Minecraft" folder.
3) Transfer the Minecraft.exe application into your new folder.
4) Open up a text editor, such as Notepad (NOT WORD), and type this code:
set APPDATA=%cd%
javaw -Xms512M -Xmx512M -cp Minecraft.exe net.minecraft.LauncherFrame
5) Save the file as "StartMinecraft.bat" Make sure it is the txt filetype and you include the .bat extension.
6) Save it in the folder you just created.
7) Now right click the .bat file and click Send To -> Shortcut.
8) Copy the "Minecraft" folder and paste it again in the Roaming folder, and rename it "Minecraft - (whatever you plan to use this version for)"
9) Create a shortcut of the .bat in the new folder.
10) Rename the shortcuts to be the same name as the folder in which they originate.
11) PROFIT!!!!

If you want it to look neat and look like actual Minecraft.exe you will need to go to the shortcut properties and change the icon to minecraft.exe.

I use this method to create 4 different configs of the game.

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#2 Fabiqui

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Posted 22 May 2012 - 04:44 PM

why do you want to run multiple minecraft.jar's ?
you can also just have a couple minecraft.jar's but you put them in another map.
or do you do this because you can't put alot of mods in one minecraft.jar?

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#3 DeadShotm1

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Posted 22 May 2012 - 05:01 PM

Certain mods are incompatible, and I like to not have to switch around jars just to play. Once done, it saves a lot of time. But I see your point.

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#4 cheesboi98

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Posted 22 May 2012 - 05:30 PM

Interesting! This will definitely come in handy when having multiple Minecraft series on the YubTubs. :D Thanks guy!

#5 DiggDownDeep

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Posted 22 May 2012 - 05:32 PM

An alternative approach would be to use Magic Launcher.

Apart from letting you run different minecraft.jars, it also lets you run Minecraft mods without having to tamper with the minecraft.jar at all. No more copying files into minecraft.jar and deleting the META-INF folder.

Very handy tool to have in your Minecraft arsenal.
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#6 arjunjha

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Posted 22 May 2012 - 06:06 PM

it would be helpful to me if someone told me how to do it on Mac. I really want to start doing minecraft YT vids and I don't want mods on some and mods on others. Thank You.
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#7 S_Kunai

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Posted 22 May 2012 - 08:25 PM

Wow this is interesting. So with this can you have multiple launchers of minecraft at once and play on two different worlds/servers at the same time?
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#8 DeadShotm1

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Posted 22 May 2012 - 08:43 PM

Wow this is interesting. So with this can you have multiple launchers of minecraft at once and play on two different worlds/servers at the same time?

Yes I will include a video to show you how it works on my pc.

it would be helpful to me if someone told me how to do it on Mac. I really want to start doing minecraft YT vids and I don't want mods on some and mods on others. Thank You.

I will try to find a tutorial to post. If you know how to install mods, it should be similar. The startup file will be different, yet the basics will be the same.

Interesting! This will definitely come in handy when having multiple Minecraft series on the YubTubs. :D Thanks guy!

Your welcome. I enjoy helping. :)

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#9 whizard_dragon

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Posted 22 May 2012 - 09:02 PM

I use MultiMC for having different instances of minecraft modded differently from one another. One of them is just a custom mash up of mods, that take a while to reinstall without this tool. Then I have a direwolf20 mod version that has all the mods he uses in his most recent lp, which is quite a bit. If you want a version other than 1.2.5 you will have to run the instance once, then replace the jar with the one you want. Then start adding your mods, or play it as it is.

#10 Gulllie

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Posted 23 May 2012 - 03:21 AM

Interesting, thanks! :)

#11 azagal73

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Posted 23 May 2012 - 03:02 PM

I use MultiMC for having different instances of minecraft modded differently from one another. One of them is just a custom mash up of mods, that take a while to reinstall without this tool. Then I have a direwolf20 mod version that has all the mods he uses in his most recent lp, which is quite a bit. If you want a version other than 1.2.5 you will have to run the instance once, then replace the jar with the one you want. Then start adding your mods, or play it as it is.


I used MultiMC too. I find it the easiest launcher to use, and it handles all the installing mods into the jar files for you. No more messing with 7zip or Winrar.

#12 whizard_dragon

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Posted 23 May 2012 - 03:56 PM

I used MultiMC too. I find it the easiest launcher to use, and it handles all the installing mods into the jar files for you. No more messing with 7zip or Winrar.

Well yeah, because you have a folder outside of your minecraft folder for that instance. That is pretty much where you dump everything that is directly getting dumped into the jar. It also keeps a backup jar in the folder in case you made a mistake and quickly want to remove certain mods. Some mod installations I like doing through the window that it gives you, but others need to be done by hand, such as if the mod you are installing is just classes but it is in a folder in a zip. You have to directly deposit the classes in the folder, because the window doesn't want to directly add classes, and if you put the folder or zip in, it would extract the folder and still have the classes in there, but if those classes were not meant to be in that folder, then you would have a problem. Still makes it easier to manage large amounts of mods, and test each, one at a time, while being able to easily take out a mod if it has compatibility issues.

#13 Avacadoguy

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Posted 23 May 2012 - 06:00 PM

So what does doing this accomplish? Could I have a modded .jar and a clean one?

#14 arjunjha

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Posted 23 May 2012 - 06:03 PM

@DeatShotm1 thank you so much.
Of you want chat or need help, drop me a PM! I'm here to help!
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#15 glappe

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Posted 25 May 2012 - 07:02 PM

Good info. Especially when you install a mod and then Minecraft gets updated the next day.
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#16 Soboy007

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Posted 08 June 2012 - 10:28 AM

I use MultiMC... It's faster and easier and it's drag-and-drop :)

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#17 Sim...

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Posted 08 June 2012 - 11:42 AM

So what does doing this accomplish? Could I have a modded .jar and a clean one?


Yes exactly that. You can also use it to run different versions of Minecraft if you want to play an older adventure map that may not have been updated to the latest version.

Personally though I prefer Magic launcher. It's versatile and keeps you up to date with the latest info every time you run Minecraft.

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#18 steve_smyth

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Posted 29 August 2012 - 05:20 AM

Just tried this. Using Magic Launcher and the two videos on YouTube here:

How To Install and Run Multiple Versions of Minecraft

Setting up configurations in Magic Launcher

I am now running a modded 1.2.5 and vanilla 1.3.2 without hassle. This is the easiest method I have seen and keeps everything in one place.
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#19 MasterJV

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Posted 07 September 2012 - 09:32 PM

Use MultiMc
It just got a huge update recently. A lot of new features like downgrading and config packs.
Forkk.net/MultiMC4
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#20 idomo

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Posted 11 September 2012 - 06:18 AM

you don't have to put the folder in C: you can put it anywhere and you can just do up to step 7 as long as you use the .bat file to start up minecraft, and you keep it in the same folder as your .minecraft. folder. (That you copied)





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