Has to be ported, since Delphi doesn't generate PDB7's.

Or at least written by someone familiar/used to Delphi, since Age of Empires utility classes are also prefixed with T, but the game was obviously written in Visual Studio - but some dev tools were written in Delphi, so somebody seems to have taken the naming scheme from there in that case.

yep, this is it. The project started out in Delphi, but I had to port it to C to integrate with the Windows Build. For some reason they didn't want to include Delphi tooling in the Windows build.