Opening a file using Swing

Building a swing client mail application has one huge hickup and can't think of a good solution. How do you automatically open an email attachment?? If its a .doc document, it should open a word document automatically instead of reinventing the wheel and code some Java RTF viewer.
A lot of attachments are compressed, you mean you have to code it all in Java? That would be absurd? With 100 now common mime types, anyone have any good suggestions of doing this.
For example - Would the windows "start" command be a good idea to simply open the folder if not a text/html or image (gif/jpg) file?
What about linux and unix and mac?? Whats the OS command to open the mail cache attachments folder? Not happy that Java doesn't support a native method to open a file. Why is that?
Hope people reply to this and bring some ideas that are effective and would not be too troublesome to implement or re-invent the wheel??
Thanks
Abraham Khalil

attachments are compressed how? like Zip files?
Anyway, how would Java implement a cross platform file open mechanism? I'm not sure there is a way in all platforms to open a file like you're thinking.
start might work in Windows, or run32dll.exe, I forget which is more appropriate. One way instead would be to allow the user to define the app to run for a particular content type, like many browsers do for helper apps. This would be more universal, at least. Save the type and application name. Many apps would allow for passing the filename to open as an argument.

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<http://forums.adobe.com/community/photoshop?view=discussions>
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Sorry, we couldn't open your file using this feature. Visio Web Access is not available on this site.

Recently installed Service Pack 1 in SharePoint Server 2013 Farm, post upgrade we are experiencing issue when opening visio documents:
I am trying to open .vsdx (visio 2013) file but encounter following issue:
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Set fs = Application.FileSearch
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well....the issue is,by the above mentioned code,I m able to open all text files like .txt or .doc....but I want to open a file having an extension .eprt or .easm.....these are all drawing related files....how to do that?
what exactly happens when a text file is opened in java...do I need to register these drawing related files somewhere?if yes,wher should I register them?
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Opening a file using Swing

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