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You double-click on it.
You can indeed launch a jar file from the command line, with the following command:
java -jar yourfile.jar
As well as this you can assign "Jar Launcher" as the default app. to use when you double-click a jar file, as follows (I don't believe you need the developer tools installed for this):
Click once on the .jar file in the Finder and then from the menubar in the Finder select File -> Get Info". Click on "Open with" and from the popup menu select "Other". A file browser window will open. In this window, go to the /System/Library/CoreServices folder and select 'Jar Launcher'. Then make sure the "Always Open With" checkbox is checked and then click Add. Then click the "Change all" button so that any jar file will be opened automatically. Finally, close the Info window and now when you double-click any of your jar files they should run automatically.
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Why cant you drag files into the minecraft jar?
If your dragging the file on top of the jar then thats because the jar is a file and not a folder. If you drag a file on top of another file your say that you want to run file B with file A. Get a zip Archive software like 7zip (google it) If your using a archive software and this is still happening the only think i can think to tell you is open the archive.
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What does file with question mark means on the MAC OS 2010?
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How can you turn on your Minecraft server easily?
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