I've posted about how you access and edit MS Office files directly from Google Drive in the past. This is just a slight update to those posts. The two methods shown below work on ChromeOS and on a PC. Crucially you don't need to install the Google Drive app on a PC to use these methods. While the Google Drive PC app is convenient on a PC, its not well suited to a multiuser environment.
Of course - the answer is to ditch Office and have an easy life. However, there are odd occasions you still need to work with these files - so these two approaches may be of help.