You could try the flat file exporter module as Rob suggests.
The module was not tested on the mentioned version but I don't expect issues using it in the 6.7.1 version, and if there are please just let me know and I can see if I can help you to overcome these issues.
See: https://appstore.home.mendix.com/link/app/432/Erwin-'t-Hoen/Flat-&-Delimited-File-Export