Users can then preview documents (PDF, DOC, XLS, PPT, TXT...) without downloading them.
This feature uses a Google service which generates previews from the downloaded documents.
To enable/disable the documents viewer
- Click the gear icon at the top of the left-hand navigation menu
- Click on the Files link
- Click on the Configure button near the Google documents viewer element in the bottom of the page
- Click on the Disable button