I have developped a small C sharp application on Visual Studio Express that has to use an external DLL. This DLL is provided by a third party.
I use Dllimport for doing that. Everything goes fine and my application runs fine on XP 32 and Vista 32.
Then I sent the application to someone who has Vista 64. At the exact step where the application tries to invoke a function from this DLL for the first time, he gets the error:
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