I'm getting "An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)"

Posted on 2011-09-12
Medium Priority
Last Modified: 2013-12-17
hi -- I've recently tried to port my 32bit application to a windows 7 64 bit target. my development environment is on a 32 bit Vista system. after thrashing around with some other problems, this is the latest error i get. I think the error is coming from a dll that was written in c and compiled under an older version of VS. I use a p/invoke interface to unmanaged code to use it (it's a driver for a usb device.) I would rather not have to sort out whether i have the source code, etc for the dll. is there a "simple" way around this? I'm also using some assemblies from National Instrument that will not run without using their 64 bit merge modules, so the installer needs to declare it a 64 bit app.
I tried using CorFlags but it expects assemblies, not unmanaged code.
I'm using .net 4.0 and vs 2010.
Question by:jdcoburn
LVL 45

Accepted Solution

AndyAinscow earned 2000 total points
ID: 36527500
My understanding is that a .net program will run as 32 bit on a 32 bit machine and 64 bit on a 64 bit machine without you having to do anything.
This sounds like on the 64 bit machine there is then problems trying to use 32 bit dll's.

There should be a setting in the solution (project) properties that will force the .net environment to always use 32 bit .net code even on a 64 bit machine.  That may well be the solution for you.

Author Closing Comment

ID: 36554178
hi -- the situation was more complicated. i eventually had to recompile a dll that linked to my app, plus pull through some other dll's that were 64bit only. anyway the solution got me started along an eventually successful path.

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