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By searching the sources trough the following lines can be found in mdlOther.bas:

Line 155 : cReg.WriteValue HKEY_CLASSES_ROOT, "*\Shell\hexeditShellMenu", "", "Ouvrir avec HexEditor", REG_SZ
Line 160 : cReg.WriteValue HKEY_CLASSES_ROOT, "Folder\Shell\hexeditShellMenu", "", "Ouvrir avec HexEditor", REG_SZ
.

So there are the keys, which are located quite unusually I might add.