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Force Internet Explorer to EPN EML in Outlook Express isntead of converting to MHTMLK file IN IE

Posted on 2008-10-26
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Last Modified: 2013-12-08
I would like to find a way to force Internet Explorer to open .eml file from a sharepoint search in Outlook Express.  Currently when selecting an eml search result Internet Explorer converts the .eml to MHTML and opens in the browser.  The issue with this is it shows no Heade information, or attachments.  If there was a way to force the .eml to open in Outlook express I could see the header info and attachments.
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Question by:itiadmin
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I found this on the MSDN Forums and it worked great:

I couldn't find an appropriate forum which would suit the type of problem I am facing so I am putting it here.

I needed to create an intranet web application that has pages with hyperlinks to eml files. The eml files as is known are email files in MIME format which outlook express can open.

However what I found was if eml files are on your machine, it opens in outlook express but when opened as an hyperlink, it opens in Internet Explorer (IE) as an mhtml file.  And any attachments that may be in the eml file are not displayed at all!

I didn't understand why IE has to poke inbetween. After searching the net, I came across a solution that required changes in the Registry of the client machine.

The change is to be made to the node HKEY_CLASSES_ROOT\MIME\Database\Content Type\message/rfc822.

The following is a REG file that can be imported for this change.

[HKEY_CLASSES_ROOT\MIME\Database\Content Type\message/rfc822]
"extension"=".eml"
"CLSID"=""

However after this change, though eml files opened in Outlook express, MHT files stopped opening in IE.

Then I simply deleted the rfc822 node and to my surprise, MHT files opened in IE and eml files opened in outlook express and everything was fine!!

But I don't want to use this sledge hammer solution.  I want to know what this registry key is for and how can I set it to achieve what I want . i.e. open  eml files from web pages in outlook express without affecting other file types
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