Chrome Office Viewer (beta) currently supports only latest beta and dev channel of Chrome browser (Windows and Mac). Also, it isn’t a small extension; you need to download 25MB of file. Once installed, you can view .doc, .docx, .xls, .xlsx, .ppt and .pptx files directly in Chrome.
Above all, the Chrome Office Viewer also protects you from malware delivered via Office files. Just like with web pages and PDFs, Chrome has added a specialized sandbox to impede attackers who use compromised Office files to try to steal private information or monitor your activities. Note: I have tried the extension on Chrome dev channel, but nothing open up or download. Hope the developer will fix it soon. Chrome Office Viewer (beta) supports Chrome for Windows and Mac. Install Chrome beta and try the extension. (Via)
