If you don’t have unrar installed, Ark won’t be able to extract any rar archive. Ark is just a graphical frontend over the corresponding archive format CLI tools. It doesn’t have any (de)compression code on its own.
See “Optional Deps” part of this command output:
$ pacman -Qi ark
Name : ark
Version : 22.12.2-1
Description : Archiving Tool
Architecture : x86_64
URL : https://apps.kde.org/ark/
Licenses : GPL
Groups : kde-applications kde-utilities
Provides : None
Depends On : kparts kpty libarchive libzip kitemmodels hicolor-icon-theme
Optional Deps : p7zip: 7Z format support [installed]
unrar: RAR decompression support [installed]
unarchiver: RAR format support [installed]
lzop: LZO format support [installed]
lrzip: LRZ format support [installed]
arj: ARJ format support
Required By : None
Optional For : None
Conflicts With : None
Replaces : None
Installed Size : 4,60 MiB
Packager : Antonio Rojas <arojas@archlinux.org>
Build Date : Rab 01 Feb 2023 01:40:58
Install Date : Sen 13 Feb 2023 08:39:33
Install Reason : Explicitly installed
Install Script : No
Validated By : Signature
Thanks so much. I to extract it by dragging it like in Windows with 7Zip, but i figured out i had press the extract button and choose witch folder to extract to.