It would be quite simply to do: some standard format
extensions are renamed for using them in comic viewers,
but they are just ZIP, RAR and ACE.
That way, 7-Zip should be associated to CBZ (if ZIP is
selected to be opened with it) and CBR (if RAR is...).
For the moment, the only way to do this is by manually
setting this option on Windows Explorer. :,(
Hope to see this setting in next releases. :)
PD: sorry for my bad English.