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Your OS does not know where to find the DLL.

One popular way of telling the OS where to look for DLL's is by adding the location to you PATH environment variable. By default it (first) also searches the directory the executable was loaded from, that's why that copying DLL's to that location also works.

This is btw also mentioned in the article at the second bullet in the beginning of the article.

Your OS does not know where to find the DLL.

One popular way of telling the OS where to look for DLL's is by adding the location to you PATH environment variable. By default it (first) also searches the directory the executable was loaded from, that's why that copying DLL's to that location also works.