Checking whether a DLL is 32-bit or 64-bit - Thu, Jun 7, 2018
A very easy method to check whether a particular DLL is x86-64 compatible or not is by using the file command in Linux. If you have bash installed on your Windows, you can type:
file MY_DLL.dll
If it’s a 64-bit DLL, you will see:
PE32+ executable (DLL) (GUI) x86-64, for MS Windows
Otherwise, it prints:
PE32 executable (DLL) (GUI) Intel 80386, for MS Windows