When accessing an ACS link for a document not supported in the browser, such as Microsoft Word, the user is presented with a dialog box that asks them whether they want to "open" or "save". Is there a way to bypass this option and force it to "open"
No out of the box solution, from a bit of searching (as I found the question intersting), you will need to add Content Disposition to your URL and use the inline argument
These will help your final solution