Script adds extra backslash to path

Sorry for the delay. One way or the other, it looks I haven't received a notification, neither in the 'junk' box.
Earlier posts can be found in thread "Change modified date after filename"

For experts this script probably looks crap, but it works fine for me.

For good order's sake below the script

Rename PATTERN="*" TO="*"
@nodeselect
@script vbscript
Option Explicit
' Change the path below if you haven't installed Opus to the default location:
dim DOpusRTPath
'DOpusRTPath = "C:\Program Files\GPSoftware\Directory Opus\dopusrt.exe"
DOpusRTPath = "D:\Directory Opus\dopusrt.exe"
Dim Shell
Set Shell = CreateObject("WScript.Shell")

Function Rename_GetNewName(strFileName, strFilePath, fIsFolder, strOldName, ByRef strNewName)
   Dim strDateTime
   Dim strCommand
   ' Set strNewName to an empty string so that Opus does not rename the file.
   strNewName = ""
   Dim debstr
   Dim gettimestamp
   gettimestamp = 0

   ' format: file name+ddmmyyyy hhmmss  dd-mm-yyyy  hh-mm-ss   dd mm yyyy  hh mm ss
     Dim re0
     Set re0 = new RegExp
     re0.Pattern = "^(?:.*?)[-_\s]*(0[1-9]|[12][0-9]|3[01])[\s\-\_\.]?(0[1-9]|1[0-2])[\s\-\_\.]?(17[0-9][0-9]|18[0-9][0-9]|19[0-9][0-9]|20[0-2][0-9])[-\s_]?([0-1]\d|[2][0-3])[\s\-\_]?([0-5]\d)[\s\-\_]?([0-5]\d)\.(?:.*?)$"

   ' format: file name+yyyymmdd hhmmss  yyyy-mm-dd  hh-mm-ss   (with or without dashes)
    Dim re1
    Set re1 = new RegExp
    re1.Pattern = "^(?:.*?)[-_\s]*(17[0-9][0-9]|18[0-9][0-9]|19[0-9][0-9]|20[0-2][0-9])[\s\-\_\.]?(0[1-9]|1[0-2])[\s\-\_\.]?(0[1-9]|[12][0-9]|3[01])[-\s_]?([0-1]\d|[2][0-3])[\s\-\_]?([0-5]\d)[\s\-\_]?([0-5]\d)\.(?:.*?)$"

   ' format: file name+ddmmyyyy dd-mm-yyyy  Date ONLY (no time)
     Dim re2
     Set re2 = new RegExp
     re2.Pattern = "^(?:.*?)[-_\s]*(0[1-9]|[12][0-9]|3[01])[\s\-\_\.]?(0[1-9]|1[0-2])[\s\-\_\.]?(17[0-9][0-9]|18[0-9][0-9]|19[0-9][0-9]|20[0-2][0-9])\.(?:.*?)$"

   ' format: file name+yyyy-mm-dd  yyyymmdd  date ONLY  without time
     Dim re3
     Set re3 = new RegExp
     re3.Pattern = "^(?:.*?)[-_\s]*(17[0-9][0-9]|18[0-9][0-9]|19[0-9][0-9]|20[0-2][0-9])[\s\-\_\.]?(0[1-9]|1[0-2])[\s\-\_\.]?(0[1-9]|[12][0-9]|3[01])\.(?:.*?)$"

   If (re0.Test(strFileName)) Then
      strDateTime = re0.Replace(strFileName, "$3$2$1 $4:$5:$6")
      gettimestamp = 1
      debstr = "(0): " & strDateTime
   ElseIf (re1.Test(strFileName)) Then
      strDateTime = re1.Replace(strFileName, "$1$2$3 $4:$5:$6")
      gettimestamp = 1
      debstr =  "(1): " & strDateTime
   ElseIf (re2.Test(strFileName)) Then
      strDateTime = re2.Replace(strFileName, "$3$2$1")
      gettimestamp = 1
      debstr =  "(2): " & strDateTime
   ElseIf (re3.Test(strFileName)) Then
      strDateTime = re3.Replace(strFileName, "$1$2$3")
      gettimestamp = 1
      debstr =  "(3): " & strDateTime
   End If
   
  If (Not IsEmpty(strDateTime)) Then
      If (gettimestamp) Then
            strDateTime = strDateTime & " " & GetFileModTime(strFilePath & "\" & strFileName)
      End If
      DOpus.OutputString "Set Date & Time " & debstr
      strCommand = """" & DOpusRTPath & """ /cmd SetAttr FILE=""" & strFilePath & "\" & strFileName & """ MODIFIED=""" & strDateTime & """"
      DOpus.OutputString "CMD = " & strCommand
      Shell.Run strCommand,0,true
   End If
End Function

Function GetFileModTime(filespec)
   Dim fso, f, s
   Set fso = CreateObject("Scripting.FileSystemObject")
   Set f = fso.GetFile(filespec)
   s = split(f.DateLastModified, " ", -1, 1)
   GetFileModTime = s(1)
End Function