AccessViolationException when using FileRead API?

While I'm no C# guru, it appears to me that you're invoking ReadFile() with wrong parameters.

I suspect that the main problem with your code is that you are requesting overlapped I/O but supplying a buffer that ceases to exist when ReadFile returns. It works on some systems an not others because the system decides whether or not to perform the operation asynchronously, and it may choose not to do async on one system and choose differently on another.

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