How to tell if .dll is 32 bits or 64 bits?
Problem
How can one test if a .dll is 32 bits (x86) or 64 bits (x64)?
Solution
Using Dependency Walker:
- Download DW from http://www.dependencywalker.com/ (no installation required).
- Launch depends.exe, go to File, click Open... and open the desired DLL file.
- In the Module section find the Module with the name of the DLL that you opened.
- The CPU column tells if the file was compiled for 32 bits or 64 bits.
Example with x64 libmysql.dll
:
Using dumpbin
(Visual Studio Tools):
- Start
VS2013 x64 Native Tools Command Prompt
orVS2013 x86 Native Tools Command Prompt
. - Execute
dumpbin /headers filename.dll
. - Machine is displayed after
FILE HEADER VALUES
Example with 32 bit libmysql.dll
:
>dumpbin /headers libmysql.dll
...FILE HEADER VALUES
14C machine (x86)...
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