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32-bit C# program won't run on Vista 64-bit

rmmarsh asked
Medium Priority
Last Modified: 2012-08-14
I have a C# program written using VS 2008 Express edition on a XP 32-bit machine.  When my Vista 64-bit users try to run the program, it crashes before even displaying the splash screen.

Is there something I have to do to get this to run in Vista 64-bit?
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The default setting for VS2008 is to use the "AnyCPU" setting which allows programs to run as 32-bit on a 32-bit PC and runs as 64-bit on a 64-bit PC.    
However, there are a few "gotcha's" to be aware of...   For example, a 64-bit application can't connect to a Microsoft Access MDB file (or an Excel XLS file).   Likewise calls to the Windows APIs need to be more precisely defined.
So, to solve the problem (either permanetly, or temporarily while hunting down coding errors), I'd suggest that you recompile the application using the "x86" flag instead of "AnyCPU".

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oops, I had forgotten that the Express Edition doesn't have a convienent way to switch between compile "targets".
here is an article that shows how to edit the *.vbproj file by hand (via notepad) to change the target from AnyCPU to x86


Thank you so much... that did the trick!
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