A family of Microsoft word processing software products for creating web, email, and print documents.
Save the document to your hard drive. You may have to right-click its icon, choose Properties from the context menu and then click the Unblock button. If you are saying that you don't have Office installed locally, you will then have to upload the file to (say) OneDrive and edit from there, using Word Online. Note that Word Online doesn't support all the features of a "complete" Office installation.