FileCount.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Linq;

static class Program
{
    static void Main(string[] args)
    {
        if (args.Length != 1) return;
        var path = args[0];

        var searchPattern = "*.log";

        var output = Path.GetTempFileName();
        using (var fs = new FileStream(output, FileMode.Create, FileAccess.Write))
        using (var sw = new StreamWriter(fs))
        {
            var dir = new DirectoryInfo(path);
            foreach (var d in dir.GetDirectories())
            {
                IEnumerable<string> query = null;
                try { query = Search(d, searchPattern); }
                catch (UnauthorizedAccessException) { continue; }

                var files = query.ToList();
                sw.WriteLine("Directory: {0} - {1}", d.Name, files.Count);
                foreach (var f in files)
                    sw.WriteLine(f);
                sw.WriteLine();
            }
        }

        Process.Start("notepad", output);
    }

    static IEnumerable<string> Search(DirectoryInfo dir, string searchPattern)
    {
        IEnumerable<string> ret = new string[0];

        foreach (var d in dir.GetDirectories())
        {
            try { ret = ret.Union(Search(d, searchPattern)); }
            catch (UnauthorizedAccessException) { }
        }

        ret = ret.Union(dir.GetFiles(searchPattern).Select(x => x.FullName));
        return ret;
    }
}