How to open .rar file in fedora 23

Install the unar package.

$ sudo dnf info unar
...
Name        : unar
Arch        : x86_64
Epoch       : 0
Version     : 1.10.1
Release     : 1.fc24
Size        : 4.6 M
Repo        : @System
From repo   : updates
Summary     : Multi-format extractor
URL         : http://unarchiver.c3.cx/commandline
License     : LGPLv2+
Description : The command-line utilities lsar and unar are capable of listing
            : and extracting files respectively in several formats including
            : RARv3. unar can serve as a free and open source replacement of
            : unrar.
$ sudo dnf install unar

The Archive Manager (gui application) will be able to open .rar files.

.rar is the extension used by Winrar to compress files and they are like Zip files but in a different format. Many other programs can decompress it and you should download the free 7-Zip which is amongst the best from here http://www.7-zip.org/download.html, choose your flavor of operating system in your case Fedora, install and use that to unrar your file