Hi IsabelXW,
I am an independent advisor and a Microsoft user like you, and I would be happy to help you out with this.
You are correct that .rar files are not natively supported by Windows, and that another software is required to open them.
A free utility that can open them is 7-Zip:
I would recommend downloading
Download 7-Zip 19.00 (2019-02-21) for Windows:
Download .exe 64-bit x64 1 MB
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Another program is WinRAR but it is only a trial version:
https://www.rarlab.com/download.htm
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
I hope this has helped you. If this is not what you are looking for, please reply and let us know and we would be happy to look into providing some different suggestions!
Regards,
-Ashton