How do I determine if a .NET application is 32 or 64 bit?

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天涯浪人
天涯浪人 2021-01-30 20:33

I have a .NET application that was supposed to be compiled as a 32-bit only application. I suspect my build server isn\'t actually doing it.

How do I determine if a .NE

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  • 2021-01-30 21:29

    If you're trying to check whether or not a running application is running in 32-bit or 64-bit mode, open task manager and check whether or not it has an asterisk (*32) next to the name of the process.

    EDIT (imported from answer by manna): As of Win8.1, the "bittyness" of a process is listed in a separate detail column labelled Platform. (Right click on any column header to expose the select columns menu.)

    If you have a compiled dll and you want to check if it's compiled for 32-bit or 64-bit mode, do the following (from a related question). I would think that you want you dll to be compiled for AnyCPU.

    Open Visual Studio Command Prompt and type "corflags [your assembly]". You'll get something like this:

    c:\Program Files (x86)\Microsoft Visual Studio 9.0\VC>corflags "C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Data.dll"
        
    Microsoft (R) .NET Framework CorFlags Conversion Tool. Version 3.5.21022.8 Copyright (c) Microsoft Corporation. All rights reserved.
        
    Version : v2.0.50727
    CLR Header: 2.5
    PE : PE32
    CorFlags : 24
    ILONLY : 0
    32BIT : 0
    Signed : 1
    

    You're looking at PE and 32BIT specifically.

    AnyCpu:

    PE: PE32 32BIT: 0

    x86:

    PE: PE32 32BIT: 1

    x64:

    PE: PE32+ 32BIT: 0

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