For reasons best known to themselves some people take delight in developing and spreading viruses. It is possible to embedded a virus within excel files. We cannot guarantee that files are virus free but the site is regularly scanned and we make particular efforts to ensure that new uploads are virus checked. Only registered users can upload to the site and it is unlikely that they would willingly upload an infected file. We also rely upon our users to post comments regarding any suspicious files. If you are particularly worried about viruses then always save downloads to disk and anti-virus scan with your preferred software before opening. Latest versions of most internet browsers automatically virus check any downloads. Files with many downloads and good rating and reviews are very unlikely to be harmful.