How does one open CTF and DAT files as listed here using ArcGIS 10.3?
I looked for instructions on their WELCOME to the Geoscientific Database Guide website but there isn't much guidance.
According to their website:
The Colaborative Research Center (SFB 267) "Deformation processes in the Andes" was a long-term project which comprised about 30 task groups which were investigating the crustal processes acting at this convergent plate margin.
If you receive no answers here that help you to read the *.ctf and/or *.dat formats that their project used, and in any event, I recommend that you try to contact someone from that project to ask them direct.