Issuer code - 4 characters 
Underscore 
Bank id - Always CQB ( 3 characters) 
Currency code - for example AUD, NZD etc for autralian dollar, new zealand dollar etc 
Underscore 
Date - in YYMMDD format - 6 digit date 
Time - in hhmmss format - 6 digit time 
Underscore 
File counter - 3 digits file counter or sequence 
Dot 
Extension - 3 digit (it should be TXT)