How to find if a particular file is loaded by processes

You can do it in a fashion with code such as the following which reads the window title of each process and looks to see if the file name is contained within it:

using System;
using System.Diagnostics;

class Program
{
    static void Main()
    {
       string search = @"C:\test.doc";
       Process[] procs = Process.GetProcesses();
       foreach(Process proc in procs)
       {
         if (proc.MainWindowTitle.IndexOf(search) > - 1)
         {
            Console.WriteLine("{0} opened by {1}", search,  proc.ProcessName);
         }
       }
       Console.ReadLine();
    }
}
      

However, in practice, I think you'd need to search for not only 'c:\test.doc' but also 'test.doc' and 'test' because some applications don't show the full path name. The problem, of course, is that this could therefore throw up a test.doc in a different folder or test.txt perhaps.