C#

using System;
using System.Text;
using System.Runtime.InteropServices;
 
public class PathUtils
{
    public const int MAX_PATH = 260;
    
    [DllImport("shlwapi.dll", CharSet = CharSet.Auto)]
    private static extern bool PathCompactPathEx(
        StringBuilder pszOut, string pszPath,
        int cchMax, int reserved);
    
    public static string CompactPath(string path, int maxLen)
    {
        StringBuilder pszOut = new StringBuilder(MAX_PATH);
        if (PathCompactPathEx(pszOut, path, maxLen, 0))
        {
            return pszOut.ToString();
        }
        else
        {
            return path;
        }
    }
}