Creating and deleting files on a remote machine

I'd try using WMI rather than File.Delete.

The code will be something like this:

using System;
using System.Management;

class Test
{
    static void Main()
    {
        ConnectionOptions options = new ConnectionOptions(); 
        options.Username = "admin"; 
        options.Password = "12345"; 
        ManagementScope scope =  null;
        ObjectQuery query = null;
        ManagementObjectSearcher searcher = null;

        try
        {
           scope = new ManagementScope(@"\\192.168.60.88\root\CIMV2", options);
           scope.Connect();
           query = new ObjectQuery(@"SELECT * FROM CIM_Datafile WHERE name = 'c:\\c$\\text.txt'");
           searcher = new ManagementObjectSearcher(scope, query); // EDIT forgot to include 'scope' previously
        }
        catch(Exception ex)
        {
           Console.WriteLine(ex.Message);
           return;
        } 
       
        foreach(ManagementObject mo in searcher.Get())
        {
           uint returnCode = (uint)mo.InvokeMethod("Delete", null);
           if (returnCode == 0)
             Console.WriteLine("File was successfully deleted");
           else
             Console.WriteLine("Deletion failed due to return code " + returnCode);
        }

        Console.ReadKey();
    }
}