I found a bug in arc-mode.el which makes it unable to open zip files, on
further analysis i found it was using incf instead of cl-incf. It is now
able to open .zip files and works as expected. I have attached a patch that fixes it.


In GNU Emacs 30.1.90 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.18.4, Xaw3d scroll bars)
Repository revision: emacs-30.1.90
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12401008
System Description: NixOS 25.11 (Xantusia)

Configured using:
 'configure
 --prefix=/nix/store/21npjyrbq3m495h63dsb7mj2kw69fg2z-emacs-unstable-30.1.90
 --disable-build-details --with-modules --with-x-toolkit=lucid
 --with-cairo --without-xft --with-compress-install
 --with-toolkit-scroll-bars --with-native-compilation
 --without-imagemagick --with-mailutils --without-small-ja-dic
 --with-tree-sitter --with-xinput2 --without-xwidgets --with-dbus
 --with-selinux'