I'd copy the text files into their own folder--just in case!
Then run a macro like:
Option Explicit
Sub testme01()
Dim myFileNames As Variant
Dim wkbk As Workbook
Dim fCtr As Long
Dim myCDP As DocumentProperties
myFileNames = Application.GetOpenFilename("Text Files, *.Txt", _
MultiSelect:=True)
If IsArray(myFileNames) = False Then
Exit Sub
End If
For fCtr = LBound(myFileNames) To UBound(myFileNames)
Call DoTheWork(myFileNames(fCtr))
Next fCtr
End Sub
Sub DoTheWork(myFileName As Variant)
Dim FSO As Object
Dim RegEx As Object
Dim myFile As Object
Dim myContents As String
Set FSO = CreateObject("Scripting.FileSystemObject")
If FSO.fileexists(myFileName) = False Then
'Do nothing
Else
Set myFile = FSO.OpenTextFile(myFileName, 1, False)
myContents = myFile.ReadAll
myFile.Close
Set RegEx = CreateObject("VBScript.RegExp")
With RegEx
.Global = True
.IgnoreCase = False
.Pattern = vbTab
myContents = .Replace(myContents, "|")
End With
Set myFile = FSO.CreateTextFile(myFileName, True)
myFile.Write myContents
myFile.Close
End If
End Sub