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I opened an unknown application with Notepad++ and now every file with that extension is opened by Notepad++ (it was set to always use the selected program to open this kind of file). How do I remove the Open with Notepad++ and set it to "Windows can't open this file", so I can use Web services?

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marked as duplicate by nc4pk, Tog, Mokubai, mpy, Dave M Oct 23 '13 at 18:55

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

You can remove its association with Notepad++ from Default Program Settings in the Control Panel, but you must select a New Program. You cannot leave any file type blank or disassociated. See Change Windows Default Programs and File Type Associations

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I don't think this solves the problem. The other Super User question, How do you remove a default program association for file types in Windows 7? may be the way to go. – Peter Mortensen Sep 5 '13 at 15:40

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