Why Forms 11g 32bit forms cannot run on 64bit without recompiling?

Hi gang
Hopefully one of the Forms gurus on this forum can give me a quick and succinct answer to the following question.
We're just setup a Windows XP 32bit install of Forms 11g on our developer machines, and a WLS install of Forms 11g and relating services on Windows 2008 64bit.
Question is, why do Forms compiled on the 32bit architecture not work on the 64bit architecture? Why do they need to be recompiled? I'm aware of the difference between 32bit/64bit OS environments, but what's that got to do with the FMX, PLX (etc) files? What are those files doing internally that's specific to the 32bit/64bit platform?
None the wiser. Your thoughts appreciated.
CM.

Hi Chris,
Nice to see you on FORMS forums
i queried myoraclesupport and got few answers hopefully you find them helpful
Applies to:
Oracle Forms - Version: 11.1 to 11.1 - Release: 11.1 to 11.1
Information in this document applies to any platform.
Forms 11g
Symptoms
--A form is compiled against a 32-bit platform, Ex(Linux 32-bit)
-- Move the .fmx to a 64-bit Platform, Ex (Linux 64-bit) and try to run it and you will receive the following error message:
"FRM-40010 : Cannot read form xxxxx"
Solution
+ Re-compile the form against the same platform where it will be launched .
For example, if the production machine is 64-bit, all forms must be compiled against the production Server (64-bit).
Disclaimer :-
===========
+ Moving an FMX from one machine to another is NOT supported. This is especially true when using Unix based platforms
See Note 299938.1 Moving Forms Applications From One Platform To Another
B - Is 64 bit Developer 11g version required for developing 11g forms and reports running on a 64 bit Deployment environment in WebLogic ?
There is no need for this. The fmb files are the same on all platforms.
Only the fmx files have to be compiled/generated for each platform.
For reports it even easier: you do not need to generate/compile the rdf, jsp files etc before running them.
C- Does it matter if the development platform for Forms and Reports developer is Windows or Linux if one is going to migrate the Forms or Reports to a 64 bit Linux platform and recompile?
No this does not matter, you are able to migrate from Windows to Unix - you must use the frmcmp_batch utility to generate the executables files.
Builders (Forms/Reports) will not be supported on 64bit operating systems.
Therefore, one can develop on the available 32bit Builders and then recompile/deploy to the 64 bit environment.
Edited by: BaiG on Jul 15, 2010 1:45 PM

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