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    <p>It is <a href="http://www.oehive.org/node/521" rel="nofollow noreferrer">usually 0</a></p> <blockquote> <p>hwnd : parent window that will receive a possible messagebox. This parameter is usually 0.</p> </blockquote> <p>It refers to the top-level window: the window you are opening does not have any parent, and is the main window for the application being executed.</p> <p>When you are switching between applications (ALT-TAB), you are displaying the next top-level window (the next app with a parent handle equals to 0) in the z-order (for instance).</p> <p>Of course, the parent to your app <a href="http://blogs.msdn.com/oldnewthing/archive/2004/02/24/79212.aspx" rel="nofollow noreferrer">can not be the Desktop Window itself</a>:</p> <blockquote> <p>If you create a child window whose parent is GetDesktopWindow(), your window is now glued to the desktop window. If your window then calls something like MessageBox(), well that's a modal dialog, and then the rules above kick in and the desktop gets disabled and the machine is toast.</p> </blockquote> <p>For the path, I would advice double quotes surrounding simple quotes: <code>" ' ... ' "</code></p> <pre><code>"'C:\\Documents and Settings\\Lab1\\My Documents\\Test.xls'" </code></pre> <p>Could work also (untested) with double double quotes : <code>" "" ... "" "</code></p> <pre><code>"""C:\\Documents and Settings\\Lab1\\My Documents\\Test.xls""" </code></pre> <p>, as illustrated by <a href="http://www.tech-archive.net/Archive/Access/microsoft.public.access.formscoding/2007-05/msg01211.html" rel="nofollow noreferrer">this thread</a>.</p> <hr> <p>Actually, as mentioned in <a href="https://stackoverflow.com/questions/310031">your other question</a> by <a href="https://stackoverflow.com/users/3857/andy">Andy</a> and by <a href="https://stackoverflow.com/users/454/mesidin">Mesidin</a>, and in <a href="http://msdn.microsoft.com/en-us/library/bb762153(VS.85).aspx" rel="nofollow noreferrer">ShellExecute Function manual</a>, you can open the file, and pass its path in parameter.</p> <pre><code>ShellExecute( NULL, "open", "Test.xls", "C:\\Documents and Settings\\Lab1\\My Documents\\", NULL, SW_SHOWNORMAL); </code></pre> <p>That means Excel is the default application for opening .xls extension files though.</p>
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    1. COThanks, that answers my question. However, when I compile the line I show above, it opens Excel, but it says it can't find the file "Test.xls". Do you have any idea why it's not working?
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    2. CODoes dir "C:\Documents and Settings\Lab1\My Documents\Test.xls" works ?
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    3. COIf it does, it must be related with all the spaces in your path. May be adding simple quotes within your double quotes " ' ' ", or the contrary (' " ... " ') would help. Without the spaces of course: I added them to better see the quotes
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