OS X Mail - open * .eml files in layout mode

How can I open * .eml files in layout mode for Mac OS X Mail? For Outlook, โ€œX-Unsent: 1โ€ seems to do the trick, but it doesnโ€™t work for Mac OS X Mail still opens in read-only mode.

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This is a super old question, but obviously got quite a few views. My curiosity drowned, I thought I would look. After some involvement, I found that you can add the following header to make the message editable:

X-Uniform-Type-Identifier: com.apple.mail-draft 

Add this to your RFC-2822 compatible message, give it the extension .eml or .emlx , and when you double-click it will open as an editable message in Mail.app.

Good luck.

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