Microsoft KB Archive/262042

= FIX: Content-Disposition: Attachment Saves Wrong Filename for Unknown Extension =

Article ID: 262042

Article Last Modified on 5/11/2006

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APPLIES TO


 * Microsoft Internet Explorer 5.0

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This article was previously published under Q262042



SYMPTOMS
Developers can return a file from Internet Information Server with a &quot;Content-disposition: attachment&quot; header to force a &quot;Save As&quot; operation by Internet Explorer: Content-disposition: attachment; filename=newName.zzz If the filename contains an extension unknown to the client computer that is receiving the file (an extension not mapped to any MIME type) Internet Explorer prompts the user to save the file with a double extension. In this example, &quot;newName.zzz&quot; would be saved as &quot;newName.zzz..zzz&quot;.



RESOLUTION
There is no known resolution for Internet Explorer 5.0.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

This bug was corrected in Internet Explorer 5.01.



Steps to Reproduce Behavior

 * 1) Save a text file on the root of your Web server and name it &quot;File.txt&quot;.
 * 2) Go into Internet Services Manager in Internet Information Server, right-click the document, and select Properties.
 * 3) Go to the HTTP Headers tab and click Add. In the Custom Header Name box, type Content-disposition . In the Custom Header Value box, type attachment; filename=newName.zzz.
 * 4) Use Internet Explore 5 to access the text file through your Web server. You will be prompted to save it to disk.
 * 5) Examine the file on disk. It will be named &quot;newName.zzz..zzz&quot;.

