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attachment with unknown extension issue with IE8

microsoft.public.internetexplorer.general






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  #1 (permalink)  
Old 03-30-2010
rlastar
 

Posts: n/a
attachment with unknown extension issue with IE8
My company save files with an unknown extension for security. When I receive
an email (using gmail) with the file attached I save the file to a folder, it
automatically changes the extension to .zip

It's definitely and IE8 issue as with Firefox it saves the file with our
unknown extension.

I've checked Internet options but can't find what setting is causing this to
happen.
Any help is appreciated.

Thanks
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  #2 (permalink)  
Old 03-30-2010
Dan
 

Posts: n/a
Re: attachment with unknown extension issue with IE8

"rlastar" <rlastar@discussions.microsoft.com> wrote in message
news:3796DBDB-79E0-471E-8574-E4576515EB08@microsoft.com...
> My company save files with an unknown extension for security. When I
> receive
> an email (using gmail) with the file attached I save the file to a folder,
> it
> automatically changes the extension to .zip
>
> It's definitely and IE8 issue as with Firefox it saves the file with our
> unknown extension.
>
> I've checked Internet options but can't find what setting is causing this
> to
> happen.
> Any help is appreciated.
>
> Thanks


IE uses "MIME Sniffing" if the content-type header and file extension can't
be used to figure out the type of file.

http://msdn.microsoft.com/en-us/libr...48(VS.85).aspx

So, if these files are ZIP files as determined from the first 200 bytes of
the file, IE will give them the .ZIP file extension (this may also occur
with other file types that internally use ZIP compression, such as Office
2007 compressed documents). This is a security feature in IE - it's designed
to stop malicious attachments masquerading as something else.

Security by obscurity is not a good practice. It's pretty trivial to
determine the type of content of most files from the first few bytes, so
using "unknown" file extension just ends up making things more difficult for
humans but has little effect on software designed to figure out the file
type as you've found out.

--
Dan

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