I checked the Visual Studio project for Progress.Messages.dll and all configurations are set to AnyCPU. The compiler may be forcing it to x64 because of a dependency. I'll have to dig deeper to figure out what's happening.
If this is an issue for you please log a bug with Tech Support.
Thank you for your reply.
I will prepare a more detailed description and open the case in the nearest days.
I'll let you know about the number of the case here.
AMD64 is the standard 64bit architecture for x86 based machine.