First of all we have to download a list of definitions offered by te developer on its website. Then, extract and copy it in the TridNet folder. From then on, the program will identify all formats.
Choose the file you want to identify, right-click it and select the 'analyse' option. In a few seconds, you'll have the results.
TrIDNet can be very helpful if you can't open a certain file or if you want to know if the file you have downloaded from internet is really the one you downloaded.