Environment:Windows Server 2003 R2 Enterprise 64bit, SP2.NET framework is supposedly installed (2.0 SP2, 3.0 SP2, 3.5 SP1)

I say "supposedly" because they are listed as installed under Add/Remove sầu programs. I"m not sure it"s properly installed, because the "ASP..NET" tab isn"t added to any of the sites in IIS.

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In the IIS Web Service Extensions section, I have both "ASP.NET v2.0.50727" (Allowed), and "ASP..NET v2.0.50727 (32-bit)" (Prohibited).

The site in question has script-exedễ thương enabled.


%1 is not a valid Win32 application.



Also check your application pool. In a 64-bit environment, you may need lớn mix "Enable 32-bit applications" in Advanced Settings.

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I had "%1 is not a valid Win32 application." error message because my PATH environment variable was messed up as well. It included this garbage from a pythuôn install:



I had "%1 is not a valid Win32 application." error message because my PATH environment variable was messed up. Well, more specifically, the PATH itself had nothing wrong with it. Instead, I had accidentally created a file named "C:Program" that was used instead of "C:Program Files" for path lookup. The accidental creation of "C:Program" was a result of calling Notepad++ on the command line for C:Program Fileschạy thử.txt (without quotation marks), so Notepad++ thought I was trying to lớn edit a tệp tin called "C:Program" và created the tệp tin for me.


I had a similar error with IIS7 on Windows Server 2008 64 Bits.

The fusion log is not of any help here, and it turned out that in my case there was a third buổi tiệc ngọt assembly that was referencing a 32 Bits only assembly or native dll. (Xceed khổng lồ be precise)

To find which assembly is being loaded by the 64 bits runtime :

Attach the VS2008 debugger on w3wp.exe process that matches your application poolIntercept all exceptions (Menu Debug / Exceptions / kiểm tra all "Common Language Runtime Exceptions"). Make sure your application is reloaded completely (by modifying the web.config, for instance).When the System.BadImageFormatException exception is raised, look for a assembly name in the stachồng trace viewer window.

Remember that all assemblies placed in the bin directory are loaded, regardless of their actual implication in the application.