Hello, 

We came across an issue while trying to use Unidac from packages compiled with Delphi 12.1 (Version 29.0.51961.7529) on 64bits windows platform.

At launch, the package tries to resolve a symbol called __init_record_FILENAME, 

which, was apparently introduced between Delphi 12 and Delphi 12.1 (in 64bits mode) and prevents loading of all runtime package not compiled with the latest version of Delphi. 

As far as I can tell, this issue is not reproduced when unidac bpl are called directly from the .exe but onl y from another RTP. 

Here's a package compiled with Delphi 12.0 (patch 1) 

and the same package compiled with Delphi 12.1 

I've attached a little demo project, build with delphi 12.1, exhibiting the behaviour : 
- 32 bits binary should run correctly 
- 64 bits binary fails at startup

I'll raise the issue with embarcadero, as it's contradicting their statement regarding minor release compatibility, but it the mean time, you might want to schedule a new build to avoid customer report like mine ^^ 

Thanks a lot for your time, 

Regards, 

(edit: 2023-04-12: archive updated with missing vcl rtp) 
(edit2: 2023-04-12: updated rtp)