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.NET Forum / .NET Framework / CLR / April 2007

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Running .NET 2.0 app as 32 bit on Windows 2003 x64

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nickdu - 17 Apr 2007 21:20 GMT
I see from another post that I can run a .NET 2.0 application as 32 bit on
Windows 2003 x64 by using the /platform:x86 switch.  Is there a way to choose
this at runtime?  Maybe a app config file setting?
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Thanks,
Nick

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Jeffrey Tan[MSFT] - 18 Apr 2007 05:52 GMT
Hi Nick,

Yes, you may config this by using the registry key below:
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows
NT\CurrentVersion\Image File Execution Options\yourapp.exe]
REG_DWORD "Wow64"= 0x00000001

This however is not the recommended way of doing this. It is preferred that
you update your build processes, or mark the executable as a post-build
step using corflags.exe.

Can you tell me why you would prefer an config file/registry opention?
Thanks.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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nickdu - 18 Apr 2007 13:22 GMT
For my current application it doesn't matter to me as much as it can only run
in 32 bit mode as it uses 32 bit unmanaged DLL's.  However, if my application
could run as either 32 bit or 64 bit and I wanted to be able to change back
and forth, I would not want to do that by rebuilding.  corflags.exe would be
fine.
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Thanks,
Nick

nicknospamdu@community.nospam
remove "nospam" change community. to msn.com

> Hi Nick,
>
[quoted text clipped - 31 lines]
> ==================================================
> This posting is provided "AS IS" with no warranties, and confers no rights.
Jeffrey Tan[MSFT] - 19 Apr 2007 13:46 GMT
Hi Nick,

Thanks for explaining the context.

Ok, if you want to know more about using Corflags.exe, please refer to the
blog entry below:
"Flipping bits on managed images to make them load with the right
bitness..."
http://blogs.msdn.com/joshwil/archive/2005/05/06/415191.aspx

If you need any further or have any other concern, please feel free to tell
me, thanks.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.

Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
where an initial response from the community or a Microsoft Support
Engineer within 1 business day is acceptable. Please note that each follow
up response may take approximately 2 business days as the support
professional working with you may need further investigation to reach the
most efficient resolution. The offering is not appropriate for situations
that require urgent, real-time or phone-based interactions or complex
project analysis and dump analysis issues. Issues of this nature are best
handled working with a dedicated Microsoft Support Engineer by contacting
Microsoft Customer Support Services (CSS) at
http://msdn.microsoft.com/subscriptions/support/default.aspx.
==================================================
This posting is provided "AS IS" with no warranties, and confers no rights.

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