I was able to install IZArc silent, but it does not register the extensions.
The link to the custom file in this forum is dead.

Someone has a registry file te correct this?

Any chance please of letting us know how to make it silently install!

if u didn't find the silent install, check my sig...........or use /VERYSILENT..........

Are you telling me that the 3.4 version uses Inno Setup?

The latest, 3.5 version, does, but it's currently only a beta release, beta 2.

@ Telenut
To register the extensions you can use the reg attached, it contains all of the supported ones. You will need to apply this in the usual manner, preferably after the IZArc install. It may also be a good idea to remove the built-in windows zipfolders before installing IZArc too.