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    <p>If you have a C .dll, it'll be either 32-bit or 64-bit. You must make sure that your site is running in the correct platform for that (that is, your site is running as a matching 32/64-bit site.)</p> <p>In IIS 7, you can configure the bitness of the application pool by right-clicking the app pool and selecting <code>Advanced Settings</code>. There's a setting called <code>Enable 32-bit applications</code>, you need to set that to <code>True</code> for 32-bit sites and <code>False</code> for 64-bit sites.</p> <p>You can use <a href="http://www.dependencywalker.com/" rel="noreferrer">Dependency Walker</a> to see if the DLL is 32-bit or 64-bit: use <code>View full paths</code> (looks like <code>C:\</code> on the toolbar) and if the dependencies of your .dll and:</p> <ul> <li>If you have a 32-bit OS, your .dll may be 64-bit. You won't be able to load it.</li> <li>If you have a 64-bit OS: <ul> <li>If the dependencies are under System32, it's a 64-bit .dll</li> <li>If the dependencies are under SysWOW64, it's a 32-bit .dll</li> </ul></li> </ul> <p>That tells you how to set the application pool. To set the app pool you can check <a href="https://help.webcontrolcenter.com/KB/a1114/how-to-enable-a-32-bit-application-pool-in-iis7-dedicatedvps.aspx" rel="noreferrer">this link</a>.</p> <p>Make sure you use <code>Advanced Settings</code> when you open the app pool properties, not basic settings. Also, these settings are not available when you bring up properties for your site - they are only available for the app pool.</p>
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