Running IIS 32-bit Applications on IIS 64-bit

ispsh

　　Do you have IIS on Windows 64 bit and want to run application that is for 32 bit. No problem. From the Inetpub admin scripts run the following:
　　"cscript.exe adsutil.vbs set W3SVC/AppPools/Enable32BitAppOnWin64 true"
　　Here are the details.
　　WindowsServer2003TM, Service Pack1 enables IIS6.0 to run 32-bit Web applications on 64-bit Windows using the Windows-32-on-Windows-64 (WOW64) compatibility layer. IIS6.0 using WOW64 is intended to run 32-bit personal productivity applications needed by software developers and administrators, including 32-bit Internet Information Services (IIS) Web applications.
　　On 64-bit Windows, 32-bit processes cannot load 64-bit DLLs, and 64-bit processes cannot load 32-bit DLLs. If you plan to run 32-bit applications on 64-bit Windows, you must configure IIS to create 32-bit worker processes. Once you have configured IIS to create 32-bit worker processes, you can run the following types of IIS applications on 64-bit Windows:

• Internet Server API (ISAPI) extensions
  
• ISAPI filters
  
• Active Server Page (ASP) applications (specifically, scripts calling COM objects where the COM object can be 32-bit or 64-bit)
  
• ASP.NET applications
  

　　IIS can, by default, launch Common Gateway Interface (CGI) applications on 64-bit Windows, because CGI applications run in a separate process.
　　Before you configure IIS to run 32-bit applications on 64-bit Windows, note the following:

• IIS only supports 32bit worker processes in Worker Process Isolation mode on 64-bit Windows
  
• On 64-bit Windows, the World Wide Web Publishing service can run 32-bit and 64-bit worker processes. Other IIS services like the IIS Admin service, the SMTP service, the NNTP service, and the FTP service run 64-bit processes only
  
• On 64-bit Windows, the World Wide Web Publishing service does not support running 32-bit and 64-bit worker processes concurrently on the same server