How to Edit Microsoft Office Documents without Having Office Installed on the Computer

https://chrome.google.com/webstore/detail/office-editing-for-docs-s/gbkeegbaiigmenfmjfclcdgdpimamgkj

This add-on made by Google for Chrome enables Chrome to work like Word and Excel. Once the add-on is installed, simply drag and drop an Office file into the browser and edit the document. When you save the changes, Chrome offers you to save the file locally on the computer in native Office file format.