For a collection just:
Code:
Dim c As Collection
c.Add hDir
Or you could just use an array, type of Long.
Code:
    Dim arr() As Long 'outside of click event
    
    'after CreateFile call
    ReDim Preserve arr(1 To UBound(arr) + 1) 'make a new element
    arr(UBound(arr)) = hDir 'assign handle to last element
    
    'to close
    Dim l As Long
    For l = 1 To UBound(arr)
        CloseHandle arr(l)
    Next l