Here is the code
Sub LoopAllExcelFilesInFolder()
'PURPOSE: To loop through all Excel files in a user specified folder and perform a set task on them
Dim wb As Workbook
Dim myPath As String
Dim myFile As String
Dim myExtension As String
Dim FldrPicker As FileDialog
Dim erow
'Optimize Macro Speed
Application.ScreenUpdating = False
Application.EnableEvents = False
Application.Calculation = xlCalculationManual
'Retrieve Target Folder Path From User
Set FldrPicker = Application.FileDialog(msoFileDialogFolderPicker)
With FldrPicker
.Title = "Select A Target Folder"
.AllowMultiSelect = False
If .Show <> -1 Then GoTo NextCode
myPath = .SelectedItems(1) & "\"
End With
'In Case of Cancel
NextCode:
myPath = myPath
If myPath = "" Then GoTo ResetSettings
'Target File Extension (must include wildcard "*")
myExtension = "*.xls"
'Target Path with Ending Extention
myFile = Dir(myPath & myExtension)
i = 1
'Loop through each Excel file in folder
Do While myFile <> ""
'Set variable equal to opened workbook
Set wb = Workbooks.Open(Filename:=myPath & myFile)
'Copy D-spacing C4 cell
wb.Worksheets(1).Range("C4:C4").Copy
'Close Activeworkbook
ActiveWorkbook.Close
' Paste C4 into another master excel file
erow = Sheet1.Cells(Rows.Count, 1).End(xlUp).Offset(1, 0).Row + i
ActiveSheet.Paste Destination:=Worksheets("Sheet1").Range(Cells(erow, 1), Cells(erow, 1))
i = i + 1
'Save and Close Workbook
' wb.Close SaveChanges:=True
'Get next file name
myFile = Dir
Loop
'Message Box when tasks are completed
MsgBox "Task Complete!"
ResetSettings:
'Reset Macro Optimization Settings
Application.EnableEvents = True
Application.Calculation = xlCalculationAutomatic
Application.ScreenUpdating = True
End Sub