REGEDIT4

[-HKEY_CLASSES_ROOT\exefile\shellex\IconHandler]

[-HKEY_CLASSES_ROOT\icofile\shellex\IconHandler]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.ico]
@="icofile"
                     
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\icofile]
@="Icon"
                     
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\icofile\DefaultIcon]
@="%1"