WNetCancelConnection2 return code question

[jadams0173]

Im using vb 2005 and have a question about the return code I'm getting from WNetCancelConnection2.
I am getting a huge numbers like 1244963895005677770 and 1239615827498500096

It is disconnecting my network share as I expect but why the weird return results?

    Private Declare Function WNetCancelConnection2 Lib "mpr.dll" _
       Alias "WNetCancelConnection2A" _
      (ByVal lpName As String, _
       ByVal dwFlags As Long, _
       ByVal fForce As Long) As Long

Public Function DisconnectNetDrive(ByVal sResource As String, ByVal Force As Boolean) As Boolean

            'connection to the specified drive.
        'ErrInfo=NO_ERROR if sucessful

        Dim errInfo As Long
        errInfo = WNetCancelConnection2(sResource, 0, 1)

        If errInfo <> NO_ERROR Then
            WnetError(errInfo)
        End If
        DisconnectNetDrive = errInfo = NO_ERROR

    End Function
    Private Function WnetError(ByVal Errcode As Long) As String

        Select Case Errcode
            Case WN_Not_Supported
                WnetError = "Function is not supported."
            Case WN_Out_Of_Memory
                WnetError = "Out of Memory."
            Case WN_Net_Error
                WnetError = "An error occurred on the network."
            Case WN_Bad_Pointer
                WnetError = "The Pointer was Invalid."
            Case WN_Bad_NetName
                WnetError = "Invalid Network Resource Name."
            Case WN_Bad_Password
                WnetError = "The Password was Invalid."
            Case WN_Bad_Localname
                WnetError = "The local device name was invalid."
            Case WN_Access_Denied
                WnetError = "A security violation occurred."
            Case WN_Already_Connected
                WnetError = "The local device was connected to a remote resource."
            Case Else
                WnetError = "Unrecognized Error " + Str(Errcode) + "."
        End Select
    End Function