TreeView and Windows Vista
Continuing the theme of ancient programs of mine still being used, I've been getting reports that the Windows version of TreeView won't install on Windows Vista and Windows 7. As with NDE, it's the installer that seems to be causing the problem. I've put a new installer on the TreeView web page (direct link here).
TreeView still seems to be used quite a bit, judging from responses to my question on BioStar, even through there are more modern alternatives. I made a brief attempt to create a replacement, namely TreeView X, but it lacks much of the functionality of the original. I keep meaning to revisit TreeView development, as it's been very good to me.