C#

[DllImport("Kernel32", CharSet = CharSet.Auto)]
static extern Int32 GetShortPathName(
String path,                // input string
StringBuilder shortPath,    // output string
Int32 shortPathLength);     // StringBuilder.Capacity
public static string ConvertLongPathToShort(string longPathName)
{
    StringBuilder shortNameBuffer;
    int size;

    shortNameBuffer = new StringBuilder();
    size = GetShortPathName(longPathName, shortNameBuffer, shortNameBuffer.Capacity);

    if(size >= shortNameBuffer.Capacity)
    {
        shortNameBuffer.Capacity = size + 1;
        GetShortPathName(longPathName, shortNameBuffer, shortNameBuffer.Capacity);
    }

    return shortNameBuffer.ToString();
}

<br />
class Example<br />
{<br />
  private static Example THIS = null;<br />
<br />
  public static Example CREATE_FORM()<br />
  {<br />
    if (THIS == null)<br />
      THIS = new Example();<br />
<br />
    return THIS;<br />
  }<br />
<br />
  private Example()<br />
  {<br />
  }<br />
}<br />