Quote Originally Posted by Sly
I have not heard of any work being done on Win64 support. It would be nice though. I don't hold much hope for Borland supporting Win64. There have been huge discussions on it in the Borland non-technical newsgroup but it doesn't seem to be getting anywhere.
No Win64 support yet. Not much action on lists either. The wait is for a good set of binutils and en-masse availability of win64.

People interested in this, could start to inventarise possible 64-bit problems in the windows related units.

Making the RTL (and then specially the WinAPI headers) win64 compliant will be more work than anything else.