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when changing a file to open with windows photo viewer it some how chaged all files on my computer to open with photo viewer there are no restore points nor backups is there a way to undo this or fix it
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Basically you need to restore the default File Associations.
When you double-click an .EXE file, the program may not launch, instead it may open in Notepad
(displaying the .exe contents), or may launch in any other application. http://windowsxp.mvps.org/exeasso.htm