The files have data for the Asia-Pacific, EU, and the Americas financial markets (thus the AP, EU, and AM in the file names), and each file is created after close of business for that region. So the create TIME for the EU file is about 8 hours after the AP file, and the AM file is about 8 hours after the EU file.

Right now, I check the FTP throughout the day, to catch each file as it's created.