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Editorial Team
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Asked: 2026-06-18T02:14:09+00:00

As title suggests I am compiling C# app using VS 2012 on a 64-bit

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As title suggests I am compiling C# app using VS 2012 on a 64-bit machine. I would like the program being built to run on a 32-bit machine.

Right now the only help I found online was for:
Menu>Build>Configuration>
Active Solution Platform defaulted to Any CPU, and I tried that but didn’t work on 32-bit machine (unless I did something wrong)

Tried Add a new one to the Debug configuration for platform x86 with build checked

Compiled and ran the app on 32-bit machine getting error A.exe is not a valid Win32 application.

My above was similar to what was done here: Link to Stack Overflow Similar Question

UPDATE 1:
The target OS is WinXP SP3 but we dont believe it has .NET 4.5 on it. I will be testing to see if compiling earlier ver of the app in .NET 4.0 will solve the problem and fix the problem. The problem may not be what the error message is displaying.

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1 Answer

  1. Editorial Team

    That error is the Win32 error ERROR_BAD_EXE_FORMAT. It’s generated by the loader and is what happens when you try to run a 64 bit process on a 32 bit operating system. There are other ways to see that error, but this is by far the most common reason for it to occur on a .exe file.

    To compile a 32 bit process you need to target x86 in your project configuration. Another alternative would be to target AnyCPU. That will result in a 32 bit process when executed on a 32 bit OS, and a 64 bit process when executed on a 64 bit OS. It would appear that your build targets x64.

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