Determining the CPU architecture of a static library (LIB) on Windows

I just built libpng on a 64-bit Windows machine using VS2008. It produces a libpng.lib file inside the \projects\visualc71\Win32_Lib_Release directory (Configuration used being "LIB Release").

I used dumpbin to inspect this LIB file:

C:\Temp\libpng-1.4.3>dumpbin projects\visualc71\Win32_LIB_Release\libpng.lib
Microsoft (R) COFF/PE Dumper Version 9.00.30729.01
Copyright (C) Microsoft Corporation.  All rights reserved.


Dump of file projects\visualc71\Win32_LIB_Release\libpng.lib

File Type: LIBRARY

  Summary

         8E4 .debug$S
         DF2 .drectve
        2BCD .rdata
       21165 .text

C:\Temp\libpng-1.4.3>

It does not however show the architecture of the LIB file. How do I find if a given LIB file is built for 32-bit or 64-bit architecture?