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How can I prevent Thunderbird to add the extension .txt to a file when open the attachment. I have the problem with .patch files which I want look with notepad++. The problem is that notepad++ does not detect the right formating for the file because the extension is .txt.

If I drag the file on the desktop an double click all is working. Why change Thunderbird the file name on opening?

I am working on Windows 7.

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Have you seen if the .txt appears if sent to another email client? – random Mar 20 '11 at 18:06
    
Outlook does not do it. And a web mailer like Google also does not change the name of the attachment on open it. – Horcrux7 Mar 20 '11 at 18:34

The plugin OpenAttachmentByExtension solve my problem.

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