The macro I created works fine, I just need to sort out the saving business. Now I get a popup asking me where to save it, but I would like it to save it under a default name and path AND encoded in UTF-8.

This is my full code I use, the bottom part saves the document I presume.

Public Sub ExportToTextFile(FName As String, Sep As String, SelectionOnly As Boolean, AppendData As Boolean)
    Dim WholeLine As String
    Dim fnum As Integer
    Dim RowNdx As Long
    Dim ColNdx As Integer
    Dim StartRow As Long
    Dim EndRow As Long
    Dim StartCol As Integer
    Dim EndCol As Integer
    Dim CellValue As String
    Dim teller As Integer
    'Teller aangemaakt ter controle voor het aantal velden
    'teller = 1

    Application.ScreenUpdating = False
On Error GoTo EndMacro:
    fnum = FreeFile
    If SelectionOnly = True Then
        With Selection
            StartRow = .Cells(1).Row
            StartCol = .Cells(26).Column
            EndRow = .Cells(.Cells.Count).Row
            EndCol = .Cells(.Cells.Count).Column
        End With
    Else
        With ActiveSheet.UsedRange
            StartRow = .Cells(1).Row
            StartCol = .Cells(26).Column
            EndRow = .Cells(.Cells.Count).Row
            EndCol = .Cells(26).Column
        End With

    End If
    If AppendData = True Then
        Open FName For Append Access Write As #fnum
    Else
        Open FName For Output Access Write As #fnum
    End If
    For RowNdx = StartRow To EndRow
        WholeLine = ""
        For ColNdx = StartCol To EndCol
            If Cells(RowNdx, ColNdx).Value = "" Then
                CellValue = ""
            Else
                CellValue = Cells(RowNdx, ColNdx).Value
            End If
            WholeLine = WholeLine & CellValue & Sep
        Next ColNdx
        WholeLine = Left(WholeLine, Len(WholeLine) - Len(Sep))
        Print #fnum, WholeLine, ""
        'Print #fnum, teller, WholeLine, ""
        'teller = teller + 1

    Next RowNdx

EndMacro:
    On Error GoTo 0
    Application.ScreenUpdating = True
    Close #fnum
End Sub

Sub Dump4Mini()
    Dim FileName As Variant
    Dim Sep As String

    FileName = Application.GetSaveAsFilename(InitialFileName:=Blank, filefilter:="Text (*.txt),*.txt")

    If FileName = False Then
        Exit Sub
    End If
    Sep = "|"
    If Sep = vbNullString Then
        Exit Sub
    End If
    Debug.Print "FileName: " & FileName, "Separator: " & Sep
    ExportToTextFile FName:=CStr(FileName), Sep:=CStr(Sep), SelectionOnly:=False, AppendData:=False
End Sub