Open Office Files without saving/downloading them. 
Author: Lewis W.
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How can you create a link for an offcie file (document or speadsheet) that when clicked opens up without it prompting to download or save a copy of the file locally, like it does with PDFs?
Posted on the
https://medium.com/@alfredpfrancis/how-to-force-files-to-open-in-the-browser-instead-of-downloading-95229d79d71e
Another approach is to make a X5 page as a hidden page. In/on that page you make an iframe where you show the document - or you could show a document from GoogleDocs.
You then make a link that opens the hidden page in a new window or as showbox.
This should function in all browsers.