Check all files and subfolders for any tracked changes

For example:

Option Explicit
Dim FSO As Object, oFolder As Object, StrFolds As String, TgtDoc As Document, StrDoc As String

Sub DocRevisionsSummary()
Application.ScreenUpdating = False
Dim TopLevelFolder As String, TheFolders As Variant, aFolder As Variant, i As Long
TopLevelFolder = GetFolder
If TopLevelFolder = "" Then Exit Sub
StrFolds = vbCr & TopLevelFolder
Set TgtDoc = ThisDocument: StrDoc = TgtDoc.FullName
If FSO Is Nothing Then
  Set FSO = CreateObject("Scripting.FileSystemObject")
End If
'Get the sub-folder structure
Set TheFolders = FSO.GetFolder(TopLevelFolder).SubFolders
For Each aFolder In TheFolders
  RecurseWriteFolderName (aFolder)
Next
'Process the documents in each folder
For i = 1 To UBound(Split(StrFolds, vbCr))
  Call CheckDocuments(CStr(Split(StrFolds, vbCr)(i)))
Next
Application.ScreenUpdating = True
End Sub

Sub RecurseWriteFolderName(aFolder)
Dim SubFolders As Variant, SubFolder As Variant
Set SubFolders = FSO.GetFolder(aFolder).SubFolders
StrFolds = StrFolds & vbCr & CStr(aFolder)
On Error Resume Next
For Each SubFolder In SubFolders
  RecurseWriteFolderName (SubFolder)
Next
End Sub

Function GetFolder() As String
Dim oFolder As Object
GetFolder = ""
Set oFolder = CreateObject("Shell.Application").BrowseForFolder(0, "Choose a folder", 0)
If (Not oFolder Is Nothing) Then GetFolder = oFolder.Items.Item.Path
Set oFolder = Nothing
End Function

Sub CheckDocuments(oFolder As String)
Dim strFldr As String, strFile As String, wdDoc As Document
strFldr = oFolder
If strFldr = "" Then Exit Sub
strFile = Dir(strFldr & "\*.doc", vbNormal)
Do While strFile <> ""
  If strFldr & "\" & strFile <> StrDoc Then
    Set wdDoc = Documents.Open(FileName:=strFldr & "\" & strFile, AddToRecentFiles:=False, ReadOnly:=False, Visible:=False)
    With wdDoc
      If .Revisions.Count > 0 Then TgtDoc.Range.InsertAfter vbCr & .FullName
      .Close False
    End With
  End If
  strFile = Dir()
Loop
Set wdDoc = Nothing
End Sub

You're welcome.