Earlier version there used to be an option to preview content files. but now there just seems to be only a screenshot.
I have a VF page which shows the some content files and i am looking to see if we can preview the document from within the VF page.
Earlier i had use the chatter js code to show the preview, but that doesnt seem to work any more as i think SF has removed the option of preview.
Another option i thought of was to use Google's docviewer
What would be the url which can be used instead of YOUR_DOCUMENT_URL if at all it can be used for Salesforce content files.