Using DA to view SMTP Export Data

Hi All

EV 11 sp1

I have a customer where we have implemented SMTP archiving. Its working fine

 - email are forwarded to EV SMTP server, these emails are converted to .EML files and stored in the SMTP Holding area

-  EV then moves this data to SMTP archive 

The customer then uses Discovery Accelerator to search and find the data. We then export the Search result to PST..and this is where the issue happens 

If I open the PST in Outlook I see its all in .eml format and Oultook cannot open .eml

Is this by design where the PST from a DA export for SMTP archving will contain emails in .EML format?

And if so how would you know view this data? I can use a EML viewer but I am interested in how other people are doing it?