We're trying to transfer a file with the german umlaut 'ä' in the filename using the .NET library of WinSCP via SFTP.
When opening the WinSCP UI, the filename is also not displayed correctly. There will be a '?' instead of 'ä' in the filename.
We tested with every of the UTF flags in WinSCP without success, but we were able to transfer the file using Filezilla, so the server seems to support UTF.