I think there is a problem on Windows 7 RC with language-files.
I installed the stable version of WinSCP on my machine and at startup it comes with this message:
When I install using the same exe on Vista there is no problem.File 'D:\Programme\WinSCP\WinSCP.DE' does not contain translation for this product version. Please remove the file. Otherwise the application will not work correctly.
The development version behaves exactly as the stable version.