Bueno aquí se las dejo pasada a vb6 espero ler sirva saludos
se las dejo con msgbox para que vean el ejemplo. la modifican a gusto.

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' Autor ..........: Pink
'Nombre......... : Alternativa a LOF | FileLen
Const GENERIC_READ = &H80000000
Const FILE_SHARE_READ = &H1
Const OPEN_EXISTING = 3
Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, lpSecurityAttributes As Any, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long
Private Declare Function GetFileSizeEx Lib "kernel32" (ByVal hFile As Long, lpFileSize As Currency) As Boolean
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Sub Form_load()
Dim file As String, hFile As String, nSize As Currency
file = "C:\Users\Pink\Desktop\1.exe"
hFile = CreateFile(file, GENERIC_READ, FILE_SHARE_READ, ByVal 0&, OPEN_EXISTING, ByVal 0&, ByVal 0&)
GetFileSizeEx hFile, nSize
CloseHandle hFile
size = nSize * 10000
MsgBox (size)
End Sub
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