We are excited to announce that the IIS.NET Forums are moving to the new Microsoft Q&A experience. Learn more >

%1 is not a valid Win32 applicationRSS

4 replies

Last post Jun 09, 2020 04:48 PM by mimion01

‹ Previous Thread|Next Thread ›
  • %1 is not a valid Win32 application

    Aug 15, 2008 07:01 PM|kapilthakur79|LINK

    I have the 64 bit Win2k8 server and on that hosted a web app. The web app is running successfully on 32 bit but on 64 bit OS it throw an error of "HTTP - 500 Internal Server Error".

    After debug the IIS is got the error %1 is not a valid Win32 application.

    I have already enabled the 32 bit mode.

    Can any help?

     Thanks Kapil

  • Re: %1 is not a valid Win32 application

    Aug 15, 2008 08:46 PM|mukhtard|LINK

    Are you trying to run the worker process as Wow64(32-bit)?

    In that case there is a good chance that your configuration is trying to load some 64-bit isapi filter, for example aspnet_filter.dll,for v2.0, on a 64-bit OS there will be two instances of this dll on your machine under \framework and \framework64 folders. You want to select the one under \framework.

    Mukhtar Desai
    IIS Performance Team

  • Re: %1 is not a valid Win32 application

    Aug 21, 2008 07:12 PM|kapilthakur79|LINK

    Apply your solution it still doesn't work. Same error is coming. After enbling feb see the error trace.

    ModuleName="IsapiModule", Notification="EXECUTE_REQUEST_HANDLER", HttpStatus="500", HttpReason="Internal Server Error", HttpSubStatus="0", ErrorCode="%1 is not a valid Win32 application. (0x800700c1)", ConfigExceptionInfo=""

    I have alo created a simple webapp which haeve only one html(static) page, and on browsing it, it will give me the error of 500 Intenal server error. Its only happen on 64 bit machine.


    Can anyone help me out?




  • Re: %1 is not a valid Win32 application

    Dec 08, 2011 11:46 AM|f1112|LINK

     In you application pool, there is a property to enable 32 bit applications

  • Re: %1 is not a valid Win32 application

    Jun 09, 2020 04:48 PM|mimion01|LINK

    tks <3

‹ Previous Thread|Next Thread ›