To get started, add the Office Edition for Docs, Sheets & Slides extension to Chrome. In your extensions toolbar (beside the url bar) you'll see the extension show up grayed out.
When you have an office document to open, it will open the document in an interface that has a little more limited editing functions. The basics will be there and, as you edit the document it will still be saved in your Google Drive account, it just won't change it's format to a Google Document. When you're done editing, you can share that file making it easier for others (who may not have Google accounts) to not have to try to figure out how to get it open.
For a list of all Apps and Extensions that have been whitelisted in Parkway, visit https://goo.gl/sUpBKk.