Are they all in the same folder?
In fact, do you need to open all the workbooks in a folder?
Or all the workbooks in multiple known folders?
If you have files in one folder--but you want to choose (click on the first and
ctrl-click on subsequent in the file|open dialog), you can do something like:
Option Explicit
Sub testme()
Dim myFileNames As Variant
Dim iCtr As Long
Dim wkbk As Workbook
myFileNames = Application.GetOpenFilename _
("Excel Files,*.xls", MultiSelect:=True)
If IsArray(myFileNames) = False Then
Exit Sub 'user hit cancel
End If
For iCtr = LBound(myFileNames) To UBound(myFileNames)
Set wkbk = Workbooks.Open(Filename:=myFileNames(iCtr))
'do something with that workbook
wkbk.close savechanges:=false 'or true???
Next iCtr
End Sub