If you want to allow the user to select a folder location, open all files in that folder and perform some operation, this is the code you can use:

Sub TestCode()

    'Initializing Variables
    Dim MyFolder As String
    Dim MyFile As String
    Dim out As Worksheet
    Dim counter As Long
    'Defining Sheets in Variables
    Set out = ThisWorkbook.ActiveSheet
    'Folder for Selection
    Set fldr = Application.FileDialog(msoFileDialogFolderPicker)
    With fldr
        .Title = "Select a Folder"
        .AllowMultiSelect = False
        .InitialFileName = strPath
        If .Show <> -1 Then Exit Sub
        sItem = .SelectedItems(1)
    End With
    MyFolder = sItem
    Set fldr = Nothing
    'Code to Extract Data from all Excel Files in Selected Folder
    counter = 0
    MyFile = Dir(MyFolder & "\*.xls*")
    Do While MyFile <> ""
        Workbooks.Open Filename:=MyFolder & "\" & MyFile
        'Perform the required operation
        'Your operation comes here
        counter = counter + 1
        Workbooks(MyFile).Close SaveChanges:=False
        MyFile = Dir()

    MsgBox "Process complete. Updated " & counter & " files."

End Sub