An MPEG-DVD is a DVD-disc with MPEG-files burned as a regular data-DVD.
To try out the MPEG-DVD compatibility of the EuroLine 6642M, I burned a DVD with the same structure as the CD I burned to test MPEG-compatibility. Then I inserted it in the DVD-player and hoped for the best.
To my surprise, the EuroLine 6642M had no problems with this disc! It displayed the MPEG pictures and everything behaved exactly as in the MPEG-compatibility tests!