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  1. #1
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    Unhappy How to open Jar files?

    So I have Nokia 3120 and i download some games what was in jar format and can't open them becaus my phone doesn't recongnize them can someone van help me to open them.
    P.S. I can send files from PC to mobile by using USB cabel or Micro SD

  2. #2
    Nokia Developer Moderator
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    Re: How to open Jar files?

    Could you please tell us what error you get (if any) when you try to open such a JAR file? In other words, what do you mean by "phone doesn't recongnize them"?
    Last edited by bogdan.galiceanu; 2008-11-29 at 09:26.

  3. #3
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    Unhappy Re: How to open Jar files?

    When I want to open a .jar my phone shows: invalid application delete?
    and it happens on all .jar files.

  4. #4
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    Re: How to open Jar files?

    Are these games designed for your device?

    Possibly, they are MIDP-2 applications, and you have a MIDP-1 device...

  5. #5
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    Red face Re: How to open Jar files?

    First How do I now what MDP- I have?
    Second How do I now what MDP- has game
    Third when I Downloaded files there was writed that my phome just need to have JAR files to open and play it's all.
    P.S. Sorry for my english I'm from Latvia amd don't know so good english.

  6. #6
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    Wink Re: How to open Jar files?

    Sorry MIDP not MDP.

  7. #7
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    Re: How to open Jar files?

    You can know your phone's MIDP version by checking its specifications page:
    http://www.forum.nokia.com/devices/3120

    The MIDP version required by a JAR file is found either in the accompanying JAD file or in the manifest file. The JAD is not always required so your game might not have come with one. However, it is a good idea to also have the JAD file. To see the manifest file extract the JAR with an archive program (Winrar for example), and in the META-INF folder you should see a MANIFEST.MF file. That's where you can find the MIDP version.

  8. #8
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    Re: How to open Jar files?

    Ok I have MDIP-1.0. If the problem is in this can I somehow a new MIDP version?

  9. #9
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    Re: How to open Jar files?

    Quote Originally Posted by Aurors View Post
    Ok I have MDIP-1.0. If the problem is in this can I somehow a new MIDP version?
    Sorry not a new but get a new version

  10. #10
    Nokia Developer Moderator
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    Re: How to open Jar files?

    If you're asking if you can upgrade your phone's MIDP version, no, it isn't possible. But there might be a solution for this problem (if this really is the problem):


    • Extract the JAR using WinRar
    • Open the MANIFEST.MF file with a text editor and change the value of the field MicroEdition-Profile from MIDP-2.0 or whatever it is to MIDP-1.0 and the same for CLDC if necessary.
    • Delete the old manifest from the JAR and add this edited one


    There is no guarantee that this will work, but you can try

    And, if you feel you want to change something from your previous posts you don't have to make new ones, just use "Edit/Delete Message" button and change the text in the post

  11. #11
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    Re: How to open Jar files?

    Thanks the game is going now ,but last question what does MIDP means?

  12. #12
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    Re: How to open Jar files?


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