title: How to make an absolute path relative to a particular folder?
body: <p>For example, how can I make this</p>
  
  <pre><code>"C:\RootFolder\SubFolder\MoreSubFolder\LastFolder\SomeFile.txt"
  </code></pre>
  
  <p>relative to this folder</p>
  
  <pre><code>"C:\RootFolder\SubFolder\"
  </code></pre>
  
  <p>if the expected result is</p>
  
  <pre><code>"MoreSubFolder\LastFolder\SomeFile.txt"
  </code></pre>