Extract specific file from a group of .zip files

I would like to extract a specific file from a folder full of .zip files.
Each .zip file contains a text file that's file name begins with RTC
The following code will extract all the documents out of each zip folder, however i only want the RTC...file. Any help would be appreciated.
Heres what i have so far

Option Explicit
Dim objFSO, objShell, strFolder, objFile, strSource, strDestination
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objShell = CreateObject("WScript.Shell")
strFolder = "C:\Temp"
For Each objFile In objFSO.GetFolder(strFolder).Files
      If Right(LCase(objFile.Name), 4) = ".zip" Then
            strSource = objFile.Path
            strDestination = "C:\Unzipped"
            'Extract the Zip file into  Directory
            Extract strSource, strDestination
      End If
MsgBox "Done"
'Zip Extraction sub
Sub Extract(ByVal myZipFile, ByVal myTargetDir)
      Dim strUZip, strCommand
      strUZip = "N:\Utilities\UltimateZip Command Line Tool\uzext.exe"
      If Right(myTargetDir, 1) <> "\" Then myTargetDir = myTargetDir & "\"
      If objFSO.FolderExists(myTargetDir) = False Then objFSO.CreateFolder(myTargetDir)
      strUZip = objFSO.GetFile(strUZip).ShortPath
      myZipFile = objFSO.GetFile(myZipFile).ShortPath
      myTargetDir = objFSO.GetFolder(myTargetDir).ShortPath
      strCommand = "cmd /c " & strUZip & " -e -o -d -p" & myTargetDir & " " & myZipFile
      objShell.Run strCommand, 0, True
End Sub
Who is Participating?
Maybe the easiest thing to do is loop through all of the files after you are done extracting them and delete any file that doesn't start with "RTC"?  Unless you are trying to avoid the full extractions I guess.  I would write it out but your code indicates to me that you will understand how to do this.
Try changing the following line:

strCommand = "cmd /c " & strUZip & " -e -o -d -p" & myTargetDir & " " & myZipFile

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strCommand = "cmd /c " & strUZip & " -e -o -d -p" & myTargetDir & " " & myZipFile & " RTC*"

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