If you want to read a Gmail message in a text editor or word processing program, you can download it as a text file easily enough. However, if you want to open it in a different email client, you might need to save it in a different format, specifically as an EML file.
You can also backup EML files, and share them with others without forwarding the original messages. Whatever your reason, Gmail makes it easy to do the conversion.
Select Show original to open the full message as a text document.
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The message opens in a new window.
From here, you can use one of two ways to convert the email to the EML format; the first is the easiest.
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Choose Save link as.
From the Save as type menu, select All Files instead of Text Document.
Paste all of the text into a text editor such as Notepad++ or Brackets.