Start by giving column A, the column with 400,000 - 600,000 program names, a header. Now select cell A1 and apply autofilter.
Now run the code below.
Excel will ask you to input a search value.
Type in *.exe for example and hit OK.
Excel will put the search value in B1 and the result below that.
Excel will now ask if there are more extentions to look for.
I hope you like the code:
Sub Test()
Dim x, y
Dim nCol, lRow, z As Integer
Start1:
x = InputBox("What is the extention? (example: *.exe)", "Copy data to next column")
z = 0
Do
z = z + 1
If Cells(1, z).Value = "" Then nCol = z
Loop Until Cells(1, z).Value = ""
Selection.AutoFilter Field:=1, Criteria1:=x
Cells(1, nCol).Value = x
lRow = Range("A" & Rows.Count).End(xlUp).Row
If lRow <> 1 Then Range("A2:A" & lRow).Copy Destination:=Cells(2, nCol)
y = MsgBox("Are there more extentions to look for?", vbYesNo)
If y = vbYes Then GoTo Start1
Selection.AutoFilter Field:=1
End Sub
