Windows 7 how to reset which application will open particular file

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Dec 5, 2009
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I set to open .SIS file using MS word.
Now I would like to restore this since all SIS files starts in WORD and have its icon - I don't want to set different application (since this is symbian file), I want that no application icon will be displayed for this file extensions.
I have win 7.
 
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