Hi and welcome to G4EF
So, you want all txt files to be open simultaneously, right ?
This is an easy task and can be done in any language. But I will prefer VBScript as you need not compile it and you can directly run it like a batch file.
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set MyFolder = objFSO.GetFolder("C:\Test")
Set objShell = WScript.CreateObject("WScript.Shell")
For Each MyFile In MyFolder.Files
If Right(MyFile.Path,4) = ".txt" Then
objShell.Run("notepad " + MyFile.Path)
Copy the code above, paste it in notepad and save the file as "Test.vbs". Run it .. it will work
The code is quite self explanatory, so you won't have difficulty understanding it. If you need to change the target folder, change the variable MyFolder.