Files
7-Zip
Open a RAR or 7z archive without buying an unzip app
Desktop appFree, including commercial use · Windows app
Open 7-Zip Why this one
Extract an archive someone sent you or bundle a folder into a ZIP. Useful when your current file manager cannot open the format; ordinary ZIP files may already open without installing anything.
Try this first
Install the current official version, open an archive from a trusted source and extract it into a separate folder. Inspect the contents before opening files.