How can I find out what the file extension is an attachment to an email?

I get an email with an attachment, I can not open with any of the applications that I have in my Ubuntu 14.04. How can I find what is the extension of the attached document, so I can find an attachment that can open and store?

I can't save it on the disk without the aid of an application

I am really curious what you could not do. There is no problem with saving a file on the disk without file extension.

I don't like when a program hides important details of me

I don't think that there is nothing that Thunderbird is hiding from you. Most likely the attachment is not a file extension - for any reason.

Tags: Thunderbird

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