Since ADTF DAT GUI Tools version 0.1.0 there is a DAT Info tool (
adtf_datinfo.exe located in the
bin folder) which you can use to look inside a .adtfdat file from
ADTF 3.x as well as .dat files from ADTF 2.x.
The tool provides a kind of list view which shows the contained
Streams of the selected DAT file.
The tool is able to display
Types for each stream within a time chart.
A click inside the chart places a kind of marker and displays the content of the underlying sample at the right side of the window.
The View menu offers some zoom options for the chart. Tools - Extensions opens a dialog to inspect the extension part of the DAT file where you can find the GUID and the ADTF version the file was recorded with for example.