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      <div class="notice">Legacy Documentation. View <a href="https://docs.nunit.org">NUnit 3 Documentation</a></div>
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<h3>Runtime Selection</h3>

<p>Before loading an assembly, NUnit must determine what runtime to use. By default
(see below for exceptions) the following rules are used:

<ol>
<li><p>If the assembly was built for the same runtime un