Open an .eml file directly in the browser without renaming

One thing I found when researching this same issue, is that the problem is with Gmail's preview app like you noticed.

By changing the file extension only, from .eml to others, Gmail handles the file in different ways.

.eml - Forces you to download the file .msg - Forces you to download or connect third party app .doc - Will not open it and asks you to connect another app .mht - Will not open and it asks you to connect another app .txt - Opens in preview, headers are present .xml - Opens in preview and handles things a little better, headers are still present

So the best thing I found is to just make sure the email comes over as an xml file.

Hope this helps you.

I have Win 10 + Chrome 71.0.3578.98 64-bit Chrome opens eml file without any trouble.

I can set up chrome as default app for .eml files by standard "Open with -> Choose another app" mechanism.

Before associating extension and app I could easily open the file by dropping it onto a Chrome page.

I found a solution to this problem a few days ago and wrote a tutorial about it. As many Windows users will know if we used the Windows Live Mail program we could preview saved emails with the extension (.eml) directly from within the Windows Explorer Preview Pane. Unfortunately if like many you stopped using that program you can no longer preview these kinds of files and have to open them one by one in another email program such as the Windows 10 Mail app which isn't always practical, especially if you have a folder full of saved emails to preview.

Fortunately I stumbled upon a useful tool which allows the user to re-associate the .eml file extension back to the Context Menu Handlers, thus allowing previewing of emails with the .eml file extension directly from within the Windows Explorer window.

Screenshot

You can read my tutorial here: [Tip] How to Enable .eml (Email) File Previews in Windows 10 Explorer

Right-click on an EML file ans select Open with >. Click on Select another app. Pick the specific browser; you may have to search for it if it is not in the list. Check Always use this app to open .eml files and click OK.

Viola! The file should play in your browser. ["Voila", if not using Vivaldi]