I have discovered the FtpWebRequest cannot handle files which contain more than one space consecutive. The following code would fail on the last line if this is the case:

                    ' FTP setup
                    loFtpWebRequest = System.Net.FtpWebRequest.Create(New Uri(lcURI))
                    loFtpWebRequest.Credentials = New System.Net.NetworkCredential(cUsername, cPassword)
                    loFtpWebRequest.Method = System.Net.WebRequestMethods.Ftp.DownloadFile
                    loFtpWebRequest.UseBinary = True
                    loFtpWebRequest.UsePassive = True
                    loFtpWebRequest.KeepAlive = False
                    loFtpWebRequest.Timeout = 10000000
                    loFtpWebRequest.ReadWriteTimeout = 10000000

                    Using loFtpWebResponse As System.Net.FtpWebResponse = loFtpWebRequest.GetResponse()

So, if I have a file name Test File.zip, which contains one space, it is ok. If I add another space between Test and File, this will fail.

The message will be:

"The remote server returned an error: (550) File unavailable (e.g., file not found, no access)."

This seems to be a flaw in that namespace. Anyone has faced that situation before? In that particular situation, I could rename the file before downloading and renaming it after. But, that seems to be quite a detour to achieve this.