This is fairly straightforward. You cannot read from Notepad, however you can read from a text file created by Notepad. Assuming the space between the columns in the list is a tab character (as copied from Excel) then the following will find the first part in the body of the document and replace it with the second. If there are other areas to process, you will have to loop through the story ranges to use this code.
Code:
Sub ReplaceFromTextFile()
Dim oRng As Range
Dim sFindText As String, sReplacement As String
Dim iNum As Integer
Dim sData As String
Dim vData As Variant
Const sName As String = "C:\Path\Forums\list.txt"
iNum = FreeFile()
Open sName For Input As #iNum
While Not EOF(iNum)
Line Input #iNum, sData
vData = Split(sData, Chr(9))
Set oRng = ActiveDocument.Range
sFindText = vData(0)
sReplacement = vData(1)
With oRng.Find
.ClearFormatting
.Replacement.ClearFormatting
Do While .Execute(FindText:=sFindText, _
MatchWholeWord:=True, _
MatchWildcards:=False, _
Forward:=True, _
Wrap:=wdFindStop) = True
oRng.Text = sReplacement
oRng.Collapse wdCollapseEnd
Loop
End With
Wend
lbl_Exit:
Set oRng = Nothing
Exit Sub
End Sub