The file names can be read as follows: Place, year, month, date, hour, minute, length of recording in minutes and seconds, and finally quality of recording.
A= excellent, B= good, C= fair.
For example, the file name AK 20050914 1039 00_48 A denotes the following: Alaska recording, 2005, September 14, 10:39 am, 0 minutes 48 seconds duration, excellent quality.