Tokyo 10.2 Update 1: cannot debug 64 bits IIS ISAPI SOAP DLL application?

Hello,

I've just downloaded the trial version of Embarcadero® C++Builder 10.2 Update 1 (Version 25.0.27659.1188). 

The first thing I wanted to try was debugging a 64 bits ISAPI DLL installed on IIS on my Windows 8 computer. I created just the sample application:

File --> New --> Other --> Web services --> SOAP server application

I installed the generated DLL as always. I installed it succesfully on IIS 8. I tested the webservices DLL in both 32 and 64 bits. They both work as expected.

I can debug the 32 bit application as allways fom the IDE with: Run --> Attach to process (important: first Run as Administrator the IDE to see the w3wp.exe pool process). I can set breakpoints and debug the 32 bits process.

But the same thing does not work with the 64 bit DLL: I see no way to set any breakpoints. After the attach to process, the IDE seems to not recognize the underlying source code. If I follow the exact same steps with the 32 bits it works  like a charm.

¿how can I achieve the same thing with 64 bits?

Thanks in advance!