Fabio Serra wrote:
For always open a dialog window I presume I need to use
alwaysAsk
http://www.xulplanet.com/references/xpcomref/ifaces/nsIMIMEInfo.html

Yes.

mi.preferredAction = Components.interfaces.nsIMIMEInfo.alwaysAsk;

But what gave you the idea that you want to set the preferredAction to that value? nsIMIMEInfo has a |alwaysAskBeforeHandling| boolean property that you should set as needed.

-Boris
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