Using the Macro :
It is translated to TiddlyWiki from Word2Wiki by RobertCastley: as posted onto WikiMedia's Meta-wiki page. go to http://meta.wikimedia.org/wiki/Word_macros#Word2TWiki for the original and the instructions there. 
 
To use it, you must first load it as a word macro: 
     * copy the vba script below into a text editor and then save it as 
 Word2TiddlyWiki.bas 
     * Open your word document and then hit Alt+F11. 
     * Then select File -> Import File. 
     * Select the file you have just saved. 
     * Close the Visual Basic screen. 
 to run the macro: 
     * Block the text you want to convert 
     * Then in your Word document select Alt+F8. 
     * The converter will do its job and should automatically copy the 
 conversion into the clipboard. 
     * All you then need to do is to paste into your editor in 
 TiddlyWiki. Code :--- VBA
Sub Word2TiddlyWiki()
    Application.ScreenUpdating = False
    'Convert Headers
    ConvertH1
    ConvertH2
    ConvertH3
    ConvertH4
    ConvertH5    
    'Convert fonts
    ConvertItalic
    ConvertBold
    ConvertUnderline
    ' todo: Add ConvertTables
    ' Copy to clipboard
    ActiveDocument.Content.Copy
    Application.ScreenUpdating = True
End Sub
Private Sub ConvertH1()
    Dim normalStyle As Style
    Set normalStyle = ActiveDocument.Styles(wdStyleNormal)
    ActiveDocument.Select
    With Selection.Find
        .ClearFormatting
        .Style = ActiveDocument.Styles(wdStyleHeading1)
        .Text = ""
        .Format = True
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
        .MatchAllWordForms = False
        .Forward = True
        .Wrap = wdFindContinue
        Do While .Execute
            With Selection
                If InStr(1, .Text, vbCr) Then
                'mark newline
                    .Collapse
                    .MoveEndUntil vbCr
                End If                
                'don't mark newline
                If Not .Text = vbCr Then
                    .InsertBefore "!"
                End If
                .Style = normalStyle
            End With
        Loop
    End With
End Sub
Private Sub ConvertH2()
    Dim normalStyle As Style
    Set normalStyle = ActiveDocument.Styles(wdStyleNormal)
    ActiveDocument.Select
    With Selection.Find
        .ClearFormatting
        .Style = ActiveDocument.Styles(wdStyleHeading2)
        .Text = ""
        .Format = True
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
        .MatchAllWordForms = False
        .Forward = True
        .Wrap = wdFindContinue
        Do While .Execute
            With Selection
                If InStr(1, .Text, vbCr) Then
                'mark newline
                    .Collapse
                    .MoveEndUntil vbCr
                End If
                'don't mark newline
                If Not .Text = vbCr Then
                    .InsertBefore "!!"
                End If
                .Style = normalStyle
            End With
        Loop
    End With
End Sub
Private Sub ConvertH3()
    Dim normalStyle As Style
    Set normalStyle = ActiveDocument.Styles(wdStyleNormal)
    ActiveDocument.Select
    With Selection.Find
        .ClearFormatting
        .Style = ActiveDocument.Styles(wdStyleHeading3)
        .Text = ""
        .Format = True
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
        .MatchAllWordForms = False
        .Forward = True
        .Wrap = wdFindContinue
        Do While .Execute
            With Selection
                If InStr(1, .Text, vbCr) Then
                'mark newline
                    .Collapse
                    .MoveEndUntil vbCr
                End If
                'don't mark newline
                If Not .Text = vbCr Then
                    .InsertBefore "!!!"
                End If
                .Style = normalStyle
            End With
        Loop
    End With
End Sub
Private Sub ConvertH4()
    Dim normalStyle As Style
    Set normalStyle = ActiveDocument.Styles(wdStyleNormal)
    ActiveDocument.Select
    With Selection.Find
        .ClearFormatting
        .Style = ActiveDocument.Styles(wdStyleHeading3)
        .Text = ""
        .Format = True
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
        .MatchAllWordForms = False
        .Forward = True
        .Wrap = wdFindContinue
        Do While .Execute
            With Selection
                If InStr(1, .Text, vbCr) Then
                'mark newline
                    .Collapse
                    .MoveEndUntil vbCr
                End If
                'don't mark newline
                If Not .Text = vbCr Then
                    .InsertBefore "!!!!"
                End If
                .Style = normalStyle
            End With
        Loop
    End With
End Sub
Private Sub ConvertH5()
    Dim normalStyle As Style
    Set normalStyle = ActiveDocument.Styles(wdStyleNormal)
    ActiveDocument.Select
    With Selection.Find
        .ClearFormatting
        .Style = ActiveDocument.Styles(wdStyleHeading3)
        .Text = ""
        .Format = True
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
        .MatchAllWordForms = False
        .Forward = True
        .Wrap = wdFindContinue
        Do While .Execute
            With Selection
                If InStr(1, .Text, vbCr) Then
                'mark newline
                    .Collapse
                    .MoveEndUntil vbCr
                End If
                'don't mark newline
                If Not .Text = vbCr Then
                    .InsertBefore "!!!!!"
                End If
                .Style = normalStyle
            End With
        Loop
    End With
End Sub
Private Sub ConvertBold()
    ActiveDocument.Select
    With Selection.Find
        .ClearFormatting
        .Font.Bold = True
        .Text = ""
        .Format = True
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
        .MatchAllWordForms = False
        .Forward = True
        .Wrap = wdFindContinue
        Do While .Execute
            With Selection
                If InStr(1, .Text, vbCr) Then
                'mark newline
                          .Font.Bold = False
                    .Collapse
                    .MoveEndUntil vbCr
                End If
                'don't mark newline
                If Not .Text = vbCr Then
                    .InsertBefore "''"
                    .InsertAfter "''"
                End If
                .Font.Bold = False
            End With
        Loop
    End With
End Sub
Private Sub ConvertItalic()
    ActiveDocument.Select
    With Selection.Find
        .ClearFormatting
        .Font.Italic = True
        .Text = ""
        .Format = True
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
        .MatchAllWordForms = False
        .Forward = True
        .Wrap = wdFindContinue
        Do While .Execute
            With Selection
                If InStr(1, .Text, vbCr) Then
                'mark newline
                    .Font.Italic = False
                    .Collapse
                    .MoveEndUntil vbCr
                End If
                'don't mark newline
                If Not .Text = vbCr Then
                    .InsertBefore "//"
                    .InsertAfter "//"
                End If
                .Font.Italic = False
            End With
        Loop
    End With
End Sub
Private Sub ConvertUnderline()
    ActiveDocument.Select
    With Selection.Find
        .ClearFormatting
        .Font.Underline = True
        .Text = ""
        .Format = True
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
        .MatchAllWordForms = False
        .Forward = True
        .Wrap = wdFindContinue
        Do While .Execute
            With Selection
                If InStr(1, .Text, vbCr) Then
                'mark newline
                    .Font.Underline = False
                    .Collapse
                    .MoveEndUntil vbCr
                End If
                'don't mark newline
                If Not .Text = vbCr Then
                    .InsertBefore "__"
                    .InsertAfter "__"
                End If
                .Font.Underline = False
            End With
        Loop
    End With
End Sub
Private Sub ConvertLists()
   Dim para As Paragraph
    For Each para In ActiveDocument.ListParagraphs
        With para.Range
            .InsertBefore " "
            For i = 1 To .ListFormat.ListLevelNumber
                If .ListFormat.ListType = wdListBullet Then
                    .InsertBefore "*"
                Else
                    .InsertBefore "#"
                End If
            Next i
            .ListFormat.RemoveNumbers
        End With
    Next para
End Sub