Is there a way to save single emails in EML format?

We need a way to export single emails + attachments and save them on our file server and we need something that works with the Web Client and ZD.

I tested the 2 Zimlets EmailDownloader and Starxpert Save.

EmailDownloader works on both but always saves single mails as zip which is really annoying to unpack them manually.

StarXpert Save doesn't seem to work with ZD.

Any other suggestions?