Note instead of modifying the registry to make notepad default viewer for unknown file types, then one could use the Send To-folder for easy access to the favorite file-viewers.REGEDIT4
[HKEY_CLASSES_ROOT\Unknown\shell\open]
@=""
[HKEY_CLASSES_ROOT\Unknown\shell\open\command]
@="NOTEPAD.EXE \"%1\""
Related Configure file types to include your own useful actions
Related Extend context menu with "Open with" for all files
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