So, i can say that status for windows and linux is basically the same. All (most of) features in Windows (not specific for win32 API) can be also found in Linux x86.
What i mean is something like:
- PDF
- Printing
- Networking
- Multimedia (Sound, video)
- Threading
- etc
Please advice
Right now, there is not a single major feature that would be implemented in Win32 and not in Linux. This is true for 2007.1 as well, however since then, a lot of stuff was added to U++ (like drag and drop).
(But note that there is no direct support for multimedia in U++).