This blog is closed as of 2/2015. @EricLaw left Microsoft in 2012, but was named an IE MVP in '13 & an IE userAgent (http://useragents.ie) in '14.
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Downloading ZIP-Based Formats
More and more file formats are based on the ZIP format . The Open Packaging Conventions use ZIP as a base format, and that means frameworks like .NET’s System.IO.Packaging also generate files that are valid ZIP files. The Office 2007+ formats are ZIP-based, and more personally, Fiddler ’s...
27 Aug 2012
Content-Length and Transfer-Encoding Validation in the IE10 Download Manager
Back in March of 2011 , I mentioned that we had encountered some sites and servers that were not sending proper Content-Length headers for their HTTP responses. As a result, we disabled our attempt to verify Content-Length for IE9. Unfortunately, by April, we’d found that this accommodation...
16 Jul 2012
Authenticode and Weak Certificate Chains
Recently, someone attempted to download a deprecated version of the Windows Script debugger . This tool was used to debug scripts prior to the introduction of more powerful, modern tools like those that are built into IE8 and later. The user emailed me when they encountered a very surprising outcome...
19 Aug 2011
Download Resumption in Internet Explorer
While most file downloads are quickly and successfully completed, some large downloads take a long time to complete, and may be interrupted in the middle by either the user choosing to “Pause” or due to networking glitches (e.g. WiFi connection dropped). One of the significant...
3 Jun 2011
Avoid “Do not save encrypted pages to disk”
Internet Explorer has an Advanced option named Do not save encrypted pages to disk . By default, this option is unchecked (except for Windows Server systems) and I recommend you leave it that way. In IE9, this option does exactly what it says it does—resources received from HTTPS URLs...
6 May 2011
Warnings on Incomplete Downloads
Recently, a user sent in the following screenshot of a security warning they encountered when attempting to download the Microsoft Zune software: Obviously, we immediately attempted to reproduce the reported problem, and we found we were unable to do so – the program was recognized as legitimate...
2 Apr 2011
Everything you need to know about Authenticode Code Signing
In today’s post, I’ll be discussing the use of Authenticode to sign software programs; this post will be of interest primarily to software developers. Large software companies (like Microsoft) often have an entire team dedicated to the code-signing and release process, but even (especially...
22 Mar 2011
File Upload and Download Limits
Over the last few years, we’ve had a few questions about WinINET’s limits for file upload and download. I’ve summarized those limits in the following table: Upload (total size) Download (per file) Internet Explorer 6 2gb 2gb...
10 Mar 2011
File Download and Filenames
Several months ago, I blogged about IE’s support for International Filenames on Downloads . Today’s post is a bit simpler and describes two cases when IE may rename downloaded files. Filename Extension and QueryString Parameters If a file download HTTP response does not contain a Content...
22 Nov 2010
Downloads and International Filenames
A few times a year, I get a question about Internet Explorer's behavior when it comes to downloading files that have non-ASCII characters in the filename, because different browsers have different behavior when handling such files. The server can suggest the name for a file download in one of two...
7 Jun 2010
Internet Explorer Cannot Download https://something
Earlier today, I was asked to troubleshoot a secure site where file downloads were always failing . Having seen this problem many times often over the years, I immediately suspected that the web developer wasn’t aware that if a user tries to download * a file over a HTTPS connection, any...
2 Oct 2009
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