Renaming Sheets (newly Opened Workbook And Change It's Name)

I'm experimenting a bit with this code. The idea is the following:

I've got one spreadsheet (ThisWorkbook) were I define 5 names for 5 worksheets in all files of a specific folder (c: emp). I get stuck at this line: "wb.Sheet2.Name = myval2", since I'm for some reason not able to activate the newly opened workbook and change it's name....

Sub wd_testing()

Dim I As Long
Dim wb As Workbook
Dim firstrow As Long
Dim sht As Worksheet
Dim cell As Object
Dim count As Integer
Dim myval2 As Variant
Dim myval3 As Variant
Dim myval4 As Variant
Dim myval5 As Variant
Dim myval6 As Variant
Application.ScreenUpdating = False

It's important to mention that there is no name conflict and the names work when entered manually.