Macro to export specific range of data to text file for each worksheet

I am seeking help to write a code that will export variable ranges in each worksheet of a workbook to separate tab-delimited text files that have the same filename but are appended with the name of the worksheet they came from (e.g., \filename_03.txt, \filename_04.txt, ...). For example, I want data starting from I6 down to the last cell of data in column K. Columns I:K will be consistent, but the number of rows will not be the same for each worksheet. Column I has formulas for I6:I60000, so Range selection in code should probably select from K6 down, then over two columns to the left. I've tried writing this, but keep getting a error (see "ExportAll" code below). The range should then be exported to a tab-delimited text file. This should then be repeated for all but the last three worksheets.

Code should do the following:

-select range I6:K#, where # = number of rows from K6 thru the last occupied cell in K
-output range to text file with specified filename appended with "_" & worksheet name
-be prompted for filename and save location, ideally from same location as workbook
-repeat for each consecutive worksheet, except for last three ("all","data","summary")
-should take same filename indicated previously, just with a new appended name


I have a code that will do this process for one worksheet at a time, but is rather cumbersome for multiple worksheets. (I found these macros on the Web: http://www.cpearson.com/excel/ImpText.aspx).

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' ExportToTextFile
' This exports a sheet or range to a text file, using a
' user-defined separator character.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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


Application.ScreenUpdating = False
On Error GoTo EndMacro:
FNum = FreeFile

If SelectionOnly = True Then
    With Selection
        StartRow = .Cells(1).Row
        StartCol = .Cells(1).Column
        EndRow = .Cells(.Cells.Count).Row
        EndCol = .Cells(.Cells.Count).Column
    End With
Else
    With ActiveSheet.UsedRange
        StartRow = .Cells(1).Row
        StartCol = .Cells(1).Column
        EndRow = .Cells(.Cells.Count).Row
        EndCol = .Cells(.Cells.Count).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 = chr(34) & chr(34)
        Else
           CellValue = Cells(RowNdx, ColNdx).Value
        End If
        WholeLine = WholeLine & CellValue & Sep
    Next ColNdx
    WholeLine = Left(WholeLine, Len(WholeLine) - Len(Sep))
    Print #FNum, WholeLine
Next RowNdx

EndMacro:
On Error GoTo 0
Application.ScreenUpdating = True
Close #FNum

End Sub
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' END ExportTextFile
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' DoTheExport
' This prompts the user for the FileName and the separtor
' character and then calls the ExportToTextFile procedure.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Sub DoTheExport()
    Dim Filename As Variant
    Dim Sep As String
    Filename = Application.GetSaveAsFilename(InitialFileName:=vbNullString, FileFilter:="Text Files (*.txt),*.txt")
    If Filename = False Then
        ''''''''''''''''''''''''''
        ' user cancelled, get out
        ''''''''''''''''''''''''''
        Exit Sub
    End If
    Sep = vbTab
    '"vbTab" outputs selection as tab-delimited'
    'to choose separator, use'
    'Sep = Application.InputBox("Enter a separator character.", Type:=2)'
    
    If Sep = vbNullString Then
        ''''''''''''''''''''''''''
        ' user cancelled, get out
        ''''''''''''''''''''''''''
        Exit Sub
    End If
    Debug.Print "FileName: " & Filename, "Separator: " & Sep
    ExportToTextFile FName:=CStr(Filename), Sep:=CStr(Sep), _
       SelectionOnly:=True, AppendData:=False
End Sub
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' END DoTheExport
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

I've also tried using the code below to process multiple worksheets, but I get an error on Line 28

Sub ExportAll2()
'http://stackoverflow.com/questions/10551353/saving-excel-worksheet-to-csv-files-with-filenameworksheet-name-using-vb

    Dim Filename As Variant
    Dim Sep As String
    Dim ws As Excel.Worksheet
    Dim SaveToDirectory As String
    Dim CurrentWorkbook As String
    Dim CurrentFormat As Long
    
    Filename = Application.GetSaveAsFilename(InitialFileName:=vbNullString, FileFilter:="Text Files (*.txt),*.txt")
    If Filename = False Then
        ''''''''''''''''''''''''''
        ' user cancelled, get out
        ''''''''''''''''''''''''''
        Exit Sub
    End If


    CurrentWorkbook = ThisWorkbook.FullName
    CurrentFormat = ThisWorkbook.FileFormat
    ' Store current details for the workbook
    Sep = vbTab
    
    For Each ws In ThisWorkbook.Worksheets
        ws.Range("K6", Range("K6").End(xlDown).Offset(0, -2).Address).Select
        'Sheets(WS.Name).Copy
        
        ThisWorkbook.Activate
        
        Debug.Print "FileName: " & Filename, "Separator: " & Sep
        ExportToTextFile FName:=CStr(Filename), Sep:=CStr(Sep), _
           SelectionOnly:=True, AppendData:=False
        
    Next ws
    
    'Application.DisplayAlerts = False
    'ActiveWorkbook.SaveAs FileName:=CurrentWorkbook, FileFormat:=CurrentFormat
    'Application.DisplayAlerts = True
    ' Temporarily turn alerts off to prevent the user being prompted
    '  about overwriting the original file.
End Sub

Any suggestions on how to do this properly?

here is an example file. I would want the macro to process worksheets 03-06, but not "all", "data" or "summary". The exported files would then be: "\20120511_Au-cit_pH5_test_03.txt", "\20120511_Au-cit_pH5_test_04.txt", etc.