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copied!<p>Ok, I resolved the problem, several factors at play here.</p> <p>Firstly this support Microsoft article was beneficial: <a href="http://support.microsoft.com/default.aspx?scid=kb;en-us;316431" rel="nofollow noreferrer">Internet Explorer is unable to open Office documents from an SSL Web site</a>.</p> <blockquote> <p><em>In order for Internet Explorer to open documents in Office (or any out-of-process, ActiveX document server), Internet Explorer must save the file to the local cache directory and ask the associated application to load the file by using IPersistFile::Load. If the file is not stored to disk, this operation fails.</em></p> <p><em>When Internet Explorer communicates with a secure Web site through SSL, Internet Explorer enforces any no-cache request. If the header or headers are present, Internet Explorer does not cache the file. Consequently, Office cannot open the file.</em> </p> </blockquote> <p>Secondly, something earlier in the page processing was causing the "no-cache" header to get written. So Response.ClearHeaders needed to be added, this cleared out the no-cache header, and the output of the page needs to allow caching.</p> <p>Thirdly for good measure, also added on Response.End, so that no other processing futher on in the request lifetime attempts to clear the headers I've set and re-add the no-cache header. </p> <p>Fourthly, discovered that content expiration had been enabled in IIS. I've left it enabled at the web site level, but since this one aspx page will serve as a gateway for downloading the files, I disabled it at the download page level.</p> <p>So here is the code snippet that works (there are a couple other minor changes which I believe are inconsequential):</p> <pre><code>System.IO.FileStream fs = new System.IO.FileStream(Server.MapPath(".") + "\\" + "TestMe.doc", System.IO.FileMode.Open); long byteNum = fs.Length; byte[] fileBytes = new byte[byteNum]; fs.Read(fileBytes, 0, (int)byteNum); Response.ClearContent(); Response.ClearHeaders(); Response.AppendHeader("Content-disposition", "attachment; filename=Testme.doc"); Response.Cache.SetCacheability(HttpCacheability.Public); Response.ContentType = "application/octet-stream"; Response.OutputStream.Write(fileBytes, 0, fileBytes.Length); Response.Flush(); Response.Close(); fs.Close(); Response.End(); </code></pre> <p>Keep in mind too, this is just for illustration. The real production code will include exception handling and likely read the file a chunk at a time (perhaps 10K).</p> <p>Mauro, thanks for catching a detail that was missing from the code as well.</p>

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