Until today when I had to look at binary files, I did that with HxD. Since this were single non-repetitive actions I had to perform, this was sufficient for me. However, the upcoming task requires that I look a certain binary file more often and interpret and modify the contents (I'm working in QA).
While the file format was developed in-house, there's neither a tool available from our development department that would parse the file for me and display it in a human readable format nor a tool to modify single items.
On my search for such a tool, I found 101 Editor which has "binary templates" which looks very much like what I need, i.e. I tell the hex editor how to interpret the file (boolean, int, long etc.) and the editor then provides a nice way to display and modify the values.
That tool should work on Windows and be gratis.