Hi Keks!
If you are sure that the failure is happening on a 32-bit OS, then you don't need anything else.
Now could you please tell us how error is manifested, what error message to you get? Please also tell how do you run the app under Cassini: by running it from the debugger/command line, or by registering the app with Cassini?
When you register an application with Cassini, the main difference between VS web server and Cassini is that Cassini, and your application, run under "Local System" user account, while when you debug in Visual Studio, everything runs under your interactive user account. Differences in security access rights may affect application's behavior.
Best regards,
UltiDev Team.
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