This works for me. Notes: I replaced rtf with docx; The files to compare must have identical names; The full paths to the folders with the ending backslashes must be entered, which I have included as examples in inputboxes.
Code:
Sub Compare_2_Fldrs()
'Compare similarly-named docs in two folders.
Dim wd As word.Application
Dim odoc As word.Document
Dim rdoc As word.Document
Dim strOPath As String
Dim strRPath As String
Dim strCPath As String
Dim strORTFfile As String
Dim ofiles() As String
Dim i As Integer
strOPath = InputBox("Enter the full path to the folder with original documents:" _
& vbCr & "e.g.:" & vbCr & "D:\Orig_Fldr\")
strRPath = InputBox("Enter the full path to the folder with revised documents:" _
& vbCr & "e.g.:" & vbCr & "D:\Revsd_Fldr\")
strCPath = InputBox("Enter the full path to the folder to save the comparisons in:" _
& vbCr & "e.g.:" & vbCr & "D:\Result_Fldr\")
Set wd = GetObject(, "Word.Application")
If wd Is Nothing Then
Set wd = CreateObject("Word.Application")
End If
ReDim Preserve ofiles(0)
strORTFfile = Dir(strOPath & "" & ("*.docx"), vbNormal)
Do While strORTFfile <> Empty
ReDim Preserve ofiles(UBound(ofiles) + 1)
ofiles(UBound(ofiles)) = strORTFfile
strORTFfile = Dir
Loop
For i = 1 To UBound(ofiles)
If Dir(strRPath & "" & ofiles(i)) <> Empty Then
Set odoc = wd.Documents.Open(strOPath & "" & ofiles(i))
Set rdoc = wd.Documents.Open(strRPath & "" & ofiles(i))
Set nDoc = Application.CompareDocuments(OriginalDocument:=odoc, _
RevisedDocument:=rdoc, _
Destination:=wdCompareDestinationNew, _
Granularity:=wdGranularityWordLevel, _
CompareFormatting:=True, _
CompareCaseChanges:=True, _
CompareWhitespace:=True, _
CompareTables:=True, _
CompareHeaders:=True, _
CompareFootnotes:=True, _
CompareTextboxes:=True, _
CompareFields:=True, _
CompareComments:=True, _
CompareMoves:=True, _
RevisedAuthor:="Merck & Co., Inc.", _
IgnoreAllComparisonWarnings:=False)
ActiveWindow.ShowSourceDocuments = wdShowSourceDocumentsNone
ActiveWindow.Visible = False
ofiles(i) = Replace(ofiles(i), Chr(13), "")
nDoc.SaveAs2 fileName:=strCPath & "" & ofiles(i), _
FileFormat:=wdFormatdocx, LockComments:=False, _
Password:="", AddToRecentFiles:=True, WritePassword:="", _
ReadOnlyRecommended:=False, EmbedTrueTypeFonts:=False, _
SaveNativePictureFormat:=False, SaveFormsData:=False, _
SaveAsAOCELetter:=False, CompatibilityMode:=0
odoc.Close SaveChanges = False
rdoc.Close SaveChanges = False
nDoc.Close SaveChanges = True
End If
Next i
End Sub