Hi Blackcat
Try this for all files in the folder C:\Data (all files must be closed)
It will insert 3 columns in the first sheet of each workbook after column B
Copy the code in a normal module in a workbook that is
not in the folder C:\Data.
Open a new workbook
Alt-F11
Insert>Module from the menu bar
paste the sub in there
Alt-Q to go back to Excel
If you do Alt-F8 you get a list of your macro's
Select "TestFile1" and press Run
Sub TestFile1()
Dim basebook As Workbook
Dim mybook As Workbook
Dim FNames As String
Dim MyPath As String
Dim SaveDriveDir As String
SaveDriveDir = CurDir
MyPath = "C:\Data"
ChDrive MyPath
ChDir MyPath
FNames = Dir("*.xls")
If Len(FNames) = 0 Then
MsgBox "No files in the Directory"
ChDrive SaveDriveDir
ChDir SaveDriveDir
Exit Sub
End If
Application.ScreenUpdating = False
Do While FNames <> ""
Set mybook = Workbooks.Open(FNames)
mybook.Sheets(1).Range("C1").Resize(, 3).EntireColumn.Insert
mybook.Close True
FNames = Dir()
Loop
ChDrive SaveDriveDir
ChDir SaveDriveDir
Application.ScreenUpdating = True
End Sub