Hi
Corflags is the inbuilt tool of Visual Studio which is used to find out the type of .dll i.e 32 bit, 64 bit or any CPU. This tool is available in Visual studio 2005 onward. i.e. VS 2005/2008/2010/2013
These are the following steps to check in Visual Studio
Step1 : Go to visual Studio command prompt like this
Step 2: Make Sure that Corflags is working in your system
Type the Corflags in Command Prompt like this
Note: if this syntax is not working then there is some problem in Environment Variable of the System
You can fix this issue like this post
How to Fix “not recognized as an internal or external command” in Windows
Step 3: Go to the file Location of DLL and type the syntax like this in below image
Corflags AjaxToolKit.dll
This is the short summary to determine the type of dll
Any CPU: PE = PE32 and 32BIT = 0
x86 bit: PE = PE32 and 32BIT = 1
64-bit: PE = PE32+ and 32BIT = 0
I hope this will help to some body.