: Open the Google Play Store and search for "RAR" by RARLAB.

: In the "WinRAR Setup" window, ensure the RAR box is checked under "Associate WinRAR with". On Android

A .rar file is a compressed folder, like a digital suitcase. You cannot "run" it directly; you must first unpack it.

Whether you're looking to install a program contained within an file or you need to install the RAR app itself to open such files, 1. How to "Install" an INSTALL.rar File

: Use a tool like 7-Zip or WinRAR to extract the contents.

: Go to the official WinRAR website and download the version for your system (usually 64-bit).