Opening a document from a Java app

I need to open a document from my Java app. It is a .rtf file and I would like it to open with the system associated application for rtf files. How should I do that?
I have tried to figure out the Runtime.exec(), but it doesn't do what I need. I have been able to open Notepad or WordPad (oh, yes, I am on a Win XT system) by specifying them in the exec function, but I can't find info on how to let the system choose the program.
Thanks for your help.
Wayne

Take a look at the JDIC project
https://jdic.dev.java.net/
In particular the org.jdesktop.jdic.filetypes.AssociationService class
https://jdic.dev.java.net/nonav/documentation/javadoc/0.9/index.html

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http://manojvnair.blogspot.com/2011/06/login-prompt-while-opening-office.html
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Sorry, we couldn't open...Error opening office documents from SharePoint 2013 in the desktop applications

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