ShinyLoot says just double click on them.
That only works if one of the files is an .exe file -- or if you have a utility installed that can open .rar files.
If they're all .rar files, it won't work unless you have WinRAR or 7-zip or some other file extraction utility already installed and associated with .rar files.
Windows can't open .rar files by itself, though it can open .zip files.