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copied!<p>Let's look at the documentation for <a href="http://msdn.microsoft.com/en-us/library/ms684175%28v=vs.85%29.aspx" rel="nofollow">LoadLibrary on MSDN</a>:</p> <blockquote> <p>If the string specifies a full path, the function searches only that path for the module. If the string specifies a relative path or a module name without a path, the function uses a standard search strategy to find the module; for more information, see the Remarks.</p> </blockquote> <p>Ok, so that explains the behavior of #1 above. If you had said:</p> <pre><code>LoadLibrary("C:\\program files\\AppFolder\\Sub\\com_server.dll") </code></pre> <p>Then that would have found your dependent DLLs, and LoadLibrary would have succeeded.</p> <p>As for how COM succeeds with #2, that really depends on how com_server.dll is registered in the registry for the InProcServer32 key. If it's a full path to the file, then LoadLibrary would just work as described above. If it's a relative path, then I would suspect COM could be doing any number of things to make finding DLLs like yours work.</p> <p>One likely possibility is that CoCreateInstance is calling <a href="http://msdn.microsoft.com/en-us/library/ms684179%28v=vs.85%29.aspx" rel="nofollow">LoadLibraryEx</a> with the <strong>LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR</strong> flag set. It may even call LoadLibrary(Ex) multiple times with different combination of flags.</p> <p>Also, given that CoCreateInstance is a system API, it's entirely possible it has a private internal version of LoadLibrary that allows for alternate search paths.</p>

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