Finding the short filename from a long filename
If you're working in the 32-bit world, your user will sometimes give you a long filename to work with. If you really want to see the short filename, not the long one, you can use the GetShortPathName function:
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Private Declare Function GetShortPathName Lib "kernel32" Alias "GetShortPathNameA" _ 
   (ByVal LongName As String, ShortName As String, ByVal bufsize As Integer) As Long

Public Function ShortFileName (ByVal LongFileName As String) As String

Dim dummy  As String
Dim length As Long

   dummy = Space(20) ' Allocate space for 1 short filename (12345678.123) and then some

   ' Retrieve short filename from long filename
   length = GetShortPathName(LongFileName, dummy, Len(dummy))

   If length > 0 Then ShortFileName = Left(dummy, length)

End Function