If you want to view EML files (Electronic Mail Format) on your Windows 11/10 PC, you can use these free online tools or desktop software.

Email to PDF Converter is a dedicated free and open-source software to convert EML files to PDF format. As it supports batch conversion, you can convert multiple EML files to PDF at a time.

In previous versions of Microsoft Outlook (the classic app), you could view the HTML code of an email by opening the email, right-clicking on it, and selecting “View source” from the context menu.

I guess that as dilbert pointed out although the .eml extension is not to blame directly, it can be a carrier/container for malicious code to reach your inside systems.

Additionally, .EML files can be sent as email attachments. These features will be available on the web in the coming weeks for all users by default.