JNLP - how to do multiple file associations?

hello, trying to find a way of associating my jnlp file with multiple file extensions through the <association> tag
I've found jnlp file examples on the web that merely have multiple <association> tags, but in the latest webstart version 6.0 this seems to be illegal - the dtd has <association?> listed, meaning one or no association elements. Lo and behold, trying multiple <association> tags just crashes webstart - it won't run my application.
Any way round this?

I suppose the first option is a way round it, but I have two very definite types of file I'd like to associate my application with, and I'd like to give them a different icon each rather than the same one.
Also when i include multiple association tags - even with different filetypes and mime-type associations - webstart 6.0 always crashes with the error below. The only change I make is commenting in or out a second assocation tag in my jnlp file, and given the trace below it appears the association tags are the cause, so I don't know if this is just the dtd with an error, it appears to be enforced in the javaws code too.
java.lang.NullPointerException
     at com.sun.javaws.LocalInstallHandler.promptReplace(Unknown Source)
     at com.sun.javaws.LocalInstallHandler.registerAssociation(Unknown Source)
     at com.sun.javaws.LocalInstallHandler.createAssociations(Unknown Source)
     at com.sun.javaws.LocalInstallHandler.install(Unknown Source)
     at com.sun.javaws.Launcher.notifyLocalInstallHandler(Unknown Source)
     at com.sun.javaws.Launcher.prepareLaunchFile(Unknown Source)
     at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
     at com.sun.javaws.Launcher.launch(Unknown Source)
     at com.sun.javaws.Main.launchApp(Unknown Source)
     at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
     at com.sun.javaws.Main$1.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)

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