download file extension is not downloading

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string url = ResolveUrl(ConfigurationManager.AppSettings["ResourcesFilePath"] + filename);
if (!RequiresRegistration || !DownloadRegistrationHelper.GetIsRegistrationEnabled())
{
htmlBuilder.AppendLine(string.Format(@"{1}", url, linkText));
}

above code renders in following manner

An Automated Solid Phase Extraction (SPE) Method for the Determination of Chloramphenicol in Honey

but while download file extension is not downloading in some machines (both in chrome & fiefox)

file extension should come in all browsers, any alternatives ? pls advise

Posted 20-Oct-15 4:49am

anbusenthil

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Sergey Alexandrovich Kryukov 20-Oct-15 11:37am

What does it mean, "download file extension"? In fact, there is no such entity as "extension", this is no more than metaphor based on the notion of obsolete file systems where it was something real.
—SA

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Richard Deeming · Answer 1 · 2015-10-20T05:39:00

If you want to force a file to be downloaded, rather than opening in the browser, you have a couple of options.

Recent versions of both Chrome and Firefox support the download attribute[^]:

C#

htmlBuilder.AppendLine(string.Format(@"<a href=""{0}"" download=""{1}"">{2}</a>", url, filename, linkText));

If that doesn't work, then you'll need to serve the file with a custom Content-Disposition header. This answer on StackOverflow[^] explains how to set the header in IIS.

In some cases, IE tries to be "helpful", and decides to open the file anyway. You can avoid that with two additional headers: X-Content-Type-Options: nosniff and X-Download-Options: noopen.