To access EML files we have to use an email client like Outlook, Outlook Express, Thunderbird, etc. But in some cases users might face some causes like:
EML File Corruption, Damage, or showing Invalid format.
To avoid these consequences, I suggest you might try EML viewer Tool, this free software allows you to view your EML file data without any need for Email-clients. You can keep all your email information and also export EML files to PDF format.