What is an rar file?

[SuzanneJack]

And how do I open it?

[vimmers]

the same as .zip
but made with winrar https://www.rarlab.com
usually can winzip open a rar file but i think it's depending how old the file are
if you don't will pay for winzip or winrar
there are a good tool like 7zip there are totally free
and can open almost every packed file

[SuzanneJack]

Thanks vims!