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launch services file association

Our application is associated with documents that have a .dart suffix.  The problem is that that suffix is already used by Apple:  com.apple.disk-image-dart.

We can't really change it, because it's already in use on other platforms.  And we like it.

Currently I'm overriding this default in a way that's working but is kind of ugly.   I haven't encountered a .dart disk image before, and it doesn't seem to be in much use, so I think overriding this is fairly safe.

Here's how I'm doing it:

{ defaults read com.apple.LaunchServices 2>&1 | grep dartdevices.dartplayer  > /dev/null 
} || { 
defaults write com.apple.LaunchServices LSHandlers -array-add '<dict><key>LSHandlerContentType</key><string>com.apple.disk-image-dart</string><key>LSHandlerRoleAll</key><string>com.dartdevices.dartplayer</string></dict>'
/System/Library/Frameworks/ApplicationServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user     
}

The defaults command is used first to ensure I don't do this twice. 
Then, if it's not already set, I add a default for this user to use our app instead of the Apple default.

Then I use lsregister to reset the users LaunchServices -- otherwise it doesn't seem to take.

Is all this safe?  Is there a better way to do this?

--Daniel

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