The CSI (QuickTrieve) format uses a master file called QMASTER for each directory which identifies the content of the individual data files. The file naming process assigns names as: F001.DTA where the first character is always an F, and the next three characters are a right-adjusted number from 1 to 120, which identifies the file record number (not the CSI commodity or stock number). The extension .DTA identifies this as a CSI format file. UA can write and maintain CSI format files if they are listed in your portfolios. Their description includes the complete path and filename, as in this example: