Dumpbin Utility
dumpbin is a program in Visual Studio Tools that helps you to display infor- mation in binary le. By using dumpbin we can check whether a dll is build for x86 or x64. In order to run it Go to Start ) Microsoft Visual Studio2008 ) Visual Studio Tools ) Visual Studio 2008 Command Prompt. Type dumpbin and it will list all the commands present. To see all the methods exported by a particular DLL, change the directory where the DLL is present and type the following command: dumpbin /exports TestStreamDrv.dll To check whether a dll is build for x86 or x64 and type the following com- mand: dumpbin /headers TestStreamDrv.dll It displays a lot of information. Look for Machine which is present in FILE HEADER VALUES . This determines whether the DLL is present for x86 or x64. References: http://thompsonng.blogspot.com/2011/03/dumpbin-checking-your-application.html