Change the default .req extension for Concurrent Request log files

Is it possible to change the default extension .req for Concurrent Request log files to something else like a .txt or .log?

We have daily emails send from concurrent jobs, and recently with the Outlook email system wide upgrade, we have stopped receiving emails from the Ebusiness system with .req log files attached.

When I rename the .req file to .txt and send email directly from server with .txt file as attachment, we receive the email with the attached .txt file.

But when I email directly from server with .req file as attachment, we  do NOT receive the email at all . it looks like the   Outlook email system is filtering out emails that have attachemnts with non standard file extensions.