[Dev-C++] using extra bytes of HWND

[Noorez K. <lor...@ho...>]

I'm confused about how to use the extra bytes of an HWND. I want to store a 
struct of my type
FileProperties. When filling the WNDCLASSEX structure, I specifed that the 
cbWndExtra member should be equal to sizeof(FileProperties). But how do 
actually store the struct in the extra bytes when i create the window. My 
program always crashes when i try.

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