Running 32bit applications on 64bit sharepoint site

Question

Hi,

I have windows 2k8 x64/windows sharepoint services on IIS7.5.
What I'm trying to do is to run 32bit application on 64bit sharepoint site. Sharepoint site is configured to use 64 bit application pool, my application - 32 bit application pool.
I get "500 internal server error" during application load.
From failed request log:

ModuleName IsapiModule
Notification 128
HttpStatus 500
HttpReason Internal Server Error
HttpSubStatus 0
ErrorCode 2147942593
ConfigExceptionInfo 
Notification EXECUTE_REQUEST_HANDLER
ErrorCode %1 is not a valid Win32 application. (0x800700c1)

Seems like sharepoint is forcing to load x64 version of ISAPI module, any ideas why or how to change that?

BTW, non-sharepoint x64 site allows running x32 applications.

BR,
Simonas

Answer 1

The solution for this issue:

1) Go to IIS manager
2) Browse to 32bit application -> IIS/Handler Mappings
3) Remove "AboMapperCustom-[some number]" handler

BR,
Simonas

Answer 2

Thank you so much for sharing this information.  I've been struggling with this issue and hadn't found the solution.  Your solution worked wonderfully.  I now have a 32 bit classic ASP application configured as a subapplication of 64 bit SharePoint.  You made my weekend.  If you live in the Washington, D.C. area, please let me buy you a beer!