Determining if third party .dll's are 32 or 64 bit

[CCarp]

We are in the process of upgrading our program from 32 to 64 bit. We've adjusted all our own assemblies accordingly, but the program is crashing. I have the feeling that it's because some of our third party .dll's are 32 bit. Is there an easy way in Visual Studio or otherwise to easily analyze all the .dll's the program depends on to see if they were built for 32 bits or 64? I know you can use Corflags, but that only works for .NET assemblies.

 

[JohnH]

c# - How to find if a native DLL file is compiled as x64 or x86? - Stack Overflow

This trick works and requires only Notepad.

Open the dll file using a text editor (like Notepad) and find the first occurrence of the string PE. The following character defines if the dll is 32 or 64 bits.

32 bits:

PE L
64 bits:

PE d†