When you go to flylog.info the very first page you see should have the following text.
Before you upload a .DAT please consider using the offline version, DatConverter, instead. DatConverter runs on your PC, i.e., you don't have to wait while the network uploads your .DAT file and then downloads the .csv. The following instructions tell you how to obtain and install DatConverter.
Don't want to do all that and just get your .DAT converted? Then press the Upload button above.
Did this not show up in your browser?
Yes this showed up & I did it...
It produced a csv that I tried to use in the program.. But I got...
"<Required> \ Data Running Time, Seconds data type"
(In a pop up window)