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Editorial Team
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Asked: 2026-05-14T15:43:33+00:00

I have an ASP.NET app that was compiled on a 32-bit machine. There are

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I have an ASP.NET app that was compiled on a 32-bit machine. There are many different assemblies that are referenced. I opened the web site’s main dll with ILDASM and looked at the .corflags. It stated it was ILONLY. However, when I run the web site locally on the 64-bit machine (Windows XP Pro 64-bit), I get “is not a valid Win32 applciation”. Shouldn’t the app run as 64-bit since it was compiled with “AnyCPU”? How can I get this to work? I am using .NET 3.5. I want the app to run as 64-bit, not 32-bit.

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1 Answer

  1. Editorial Team

    Probably some of your dlls are not compiled as AnyCPU.

    Use the Process Monitor from sysinternals to locate it and fix it / change it.

    With the Process monitor you can see where its fail to load a dll.

    Also you can use the dependencyWalker after you locate some of your problematic dll, to see more info on the dll that are not loaded.

    Hope this help.

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