Thanks a lot.
I did not quite understand the logic, when to run the macro because sometimes it works and sometimes it does not work for me.
should I perform a search / replace in one file anf only after that need to run the macro?

I tried my luck, and I have no luck :-)
Help would be appreciated

Sub MFindReplace()
Dim aDoc As Document
Dim strFindText As String
Dim strReplaceText As String
With Selection
.HomeKey Unit:=wdStory
With Selection.Find
.Text = strFindText
.Replacement.Text = strReplaceText
.Forward = True
.Wrap = wdFindContinue
.Format = False
.MatchCase = False
.MatchWholeWord = False
.MatchWildcards = False
.MatchSoundsLike = False
.MatchAllWordForms = False
End With
Selection.Find.Execute Replace:=wdReplaceAll
For Each aDoc In Application.Documents
MsgBox aDoc.Name
Next aDoc
End With
End Sub