Script Download: VBSFileAssociation.zip
http://gallery.technet.microsoft.com/scriptcenter/Script-for-resetting-file-103c5a89

This VBScript illustrates how to reset file association for a .doc file (It can be used for other file types as well with slight modification)

If we double click on a text file, it opens with Notepad by default whereas the desire application to open .txt would be Notepad++. For this we need to manually reset file association with a right click and selecting the option “Open with”. How about changing other file types (.cs, .cpp and so on) to be associated with Notepad++? This needs changing the file association for each and every file type which is not time efficient. We can use this VBScript to change file association for multiple file types.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery