InfoPath Dev

Following Problem:

Using: Infopath 2007, VSTA, MOSS

My.Computer.Network.UploadFile("c:\3.pdf", "http://server:33655/pdfs/3.pdf", "username", "password", True, 500)

Error: 

"System.Net.WebException wurde nicht von Benutzercode behandelt.
  Message="The remote server returned an error: (404) Not Found."
  Source="Microsoft.VisualBasic"
  StackTrace:
       at Microsoft.VisualBasic.MyServices.Internal.WebClientCopy.UploadFile(String sourceFileName, Uri address)
       at Microsoft.VisualBasic.Devices.Network.UploadFile(String sourceFileName, Uri address, ICredentials networkCredentials, Boolean showUI, Int32 connectionTimeout, UICancelOption onUserCancel)
       at Microsoft.VisualBasic.Devices.Network.UploadFile(String sourceFileName, Uri address, String userName, String password, Boolean showUI, Int32 connectionTimeout, UICancelOption onUserCancel)
       at Microsoft.VisualBasic.Devices.Network.UploadFile(String sourceFileName, String address, String userName, String password, Boolean showUI, Int32 connectionTimeout, UICancelOption onUserCancel)
       at Microsoft.VisualBasic.Devices.Network.UploadFile(String sourceFileName, String address, String userName, String password, Boolean showUI, Int32 connectionTimeout)
       at _23._12._09.FormCode.CTRL418_5_Clicked(Object sender, ClickedEventArgs e) in C:\...\FormCode.vb:line 390
       at Microsoft.Office.InfoPath.Internal.ButtonEventHost.OnButtonClick(DocActionEvent pEvent)
       at Microsoft.Office.Interop.InfoPath.SemiTrust._ButtonEventSink_SinkHelper.OnClick(DocActionEvent pEvent)
"

 This command looks very simple, but i dont get it.

Have also tried several other commands like my.computer.filesystem.copyfile(...) but it doesn't like URI as source or destination file. {"URI formats are not supported."}

Btw. exporting views to the Library is no problem (using " Me.CurrentView.Export("http://hansewww:33655/PDFs/" + fileName, ExportFormat.Pdf " ) 

Thanks for help.

edit:

http://msdn.microsoft.com/en-us/library/w3kksch7(VS.80).aspx