What is export.export.application.platform.macosx for in preferences.txt

I've noticed that _export.application.platform.macosx=tru_e in Preferences.txt is set to true, even though I am on a Windows platform.

Would this have anything to do with the Java-related problems I've been having? http://arduino.cc/forum/index.php/topic,81356.msg613585/topicseen.html#msg613585

What is this field for?