REGEDIT4

[-HKEY_CLASSES_ROOT\Unknown]

[HKEY_CLASSES_ROOT\Unknown]

[HKEY_CLASSES_ROOT\Unknown\shell]

[HKEY_CLASSES_ROOT\Unknown\shell\open]
@="Quickview with Notepad"

[HKEY_CLASSES_ROOT\Unknown\shell\open\command]
@="notepad.exe %1"