The current version (Altium 23) is a mix of Delphi and .NET (I guess C# but couldn't quickly find evidence). I don't have time to try to exactly figure out what

The current version (Altium 23) is a mix of Delphi and .NET (I guess C# but couldn't quickly find evidence). I don't have time to try to exactly figure out what's used for what, but a quick test shows that the main executable and dozens of DLLs of the latest Altium version are compiled with Delphi 30.