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I have a previously deployed Win32 c++ DirectX9 application. It was built on a Windows Vista 64bit machine and is now installed and running on a Windows7 64bit machine.

I've recently ungraded my development machine to Windows8 64bit, re-installed Visual Studio 2010 Express and the same DirectX SDK as before (June'10). I have also installed the Windows8 SDK.

I've been asked to change the logic of the code a little and send a new .exe

The new build runs happily on the development machine but the error below appears on the target machine:

Unsupported 16 bit Application
The Program or feature "...App.exe" cannot start or run due to the incompatibility with 64-bit version of Windows. Please contact the software vendor....

Project settings say Win32 for debug and release version... In fact I wasn't sure it was possible to build 16 bit applications!

Any clues as to where my error is would be very much appreciated.

Thanks for your time.

Posted 3-Mar-13 23:04pm
LokoLuke 4-Mar-13 5:35am
Hi Ian,

Seems to be a very strange error. Would I be right in saying your developing on Windows8 and deploying on Windows7?

I know the buzz for developing in Windows 8 is developing metro apps. Maybe there is a default setting for compiling as a metro app. It is possible they are 16bit!!??

I had a quick look online but couldn't find much material on it
ianwalters16 5-Mar-13 4:19am
Thanks for the idea Luke. I'll look into that one and keep googling the error message...

Just for interest, I've read that Windows 7/8 64 bit cannot run 16 bit applications. The 32 bit versions of Windows can but certainly for Windows 8 you need to turn on 16 bit support from the control panel. It is disabled by default.

So I doubt Metro Apps are 16 bit, but I'll be happy to be corrected!

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