[alternatetwo]

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.

[pjmlp]

Borland C++ frameworks used the same coding conventions as Turbo Pascal/Delphi.

They still use them.