[k@Z@k]

Я делал так:
1. Создавал сетевой диск/папку (проходил аунтефикацию, добовлял в систему)
2. работал с файлами.
3. дисконект

Код:

//-------------connect-------------------------
var
  lpNetResource: TNetResource;
  strMessage: string;
  nError: DWORD;
begin
  with lpNetResource do
    begin
      dwType := RESOURCETYPE_DISK;
      lpLocalName := 'Y:';
      lpRemoteName := '\\10.101.0.21\Новая1';
      lpProvider := '';
    end;
  nError := WNetAddConnection2(lpNetResource, 'password', 'login', 0);

  case nError of
    ERROR_ACCESS_DENIED: strMessage :=
      'Access to the network resource was denied.';
    ERROR_ALREADY_ASSIGNED: strMessage :=
      'The local device specified by lpLocalName is already connected to a network resource.';
    ERROR_BAD_DEV_TYPE: strMessage :=
      'The type of local device and the type of network resource do not match.';
    ERROR_BAD_DEVICE: strMessage :=
      'The value specified by lpLocalName is invalid.';
    ERROR_BAD_NET_NAME: strMessage :=
      'The value specified by lpRemoteName is not acceptable to any network resource provider. The resource name is invalid, or the named resource cannot be located.';
    ERROR_BAD_PROFILE: strMessage :=
      'The user profile is in an incorrect format.';
    ERROR_BAD_PROVIDER: strMessage :=
      'The value specified by lpProvider does not match any provider.';
    ERROR_BUSY: strMessage :=
      'The router or provider is busy, possibly initializing. The caller should retry.';
    ERROR_CANCELLED: strMessage :=
      'The attempt to make the connection was cancelled by the user through a dialog box from one of the network resource providers, or by a called resource.';
    ERROR_CANNOT_OPEN_PROFILE: strMessage :=
      'The system is unable to open the user profile to process persistent connections.';
    ERROR_DEVICE_ALREADY_REMEMBERED: strMessage :=
      'An entry for the device specified in lpLocalName is already in the user profile.';
    ERROR_EXTENDED_ERROR: strMessage :=
      'A network-specific error occured. Call the WNetGetLastError function to get a description of the error.';
    ERROR_INVALID_PASSWORD: strMessage := 'The specified password is invalid.';
    ERROR_NO_NET_OR_BAD_PATH: strMessage :=
      'A network component has not started, or the specified name could not be handled.';
    ERROR_NO_NETWORK: strMessage := 'There is no network present.';
    ERROR_LOGON_FAILURE: strMessage :=
      'Logon failure: unknown user name or bad password.';
    ERROR_BAD_NETPATH: strMessage := 'The network path was not found.';
    ERROR_SESSION_CREDENTIAL_CONFLICT: strMessage :=
      'The credentials supplied conflict with an existing set of credentials.';

    else
      strMessage := 'No Error';
  end;

  if nError <> NO_ERROR then
    strMessage := 'Error-' + IntToStr(nError) + #13 + strMessage
  else
    strMessage := 'Error-' + IntToStr(nError);

  ShowMessage(strMessage);
end;

//--------disconnect-----
 WNetCancelConnection('Y:', True);