abandonedInprocServer32.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Management;

namespace ComAbandonment
{
    public class ComAbandonment
    {
        public static void Main()
        {
            try
            {
                ManagementObjectSearcher searcher =
                    new ManagementObjectSearcher("root\\CIMV2",
                    "SELECT * FROM Win32_ClassicCOMClassSetting");

                List<string> inprocsvr32 = new List<string>();

                //Query all objects for their InProcSvr32 value and if not null, check that the file still exists
                foreach (ManagementObject queryObj in searcher.Get())
                {
                    object inprocsvrVal = queryObj["InprocServer32"];
                    string inprocsvrStr = Convert.ToString(inprocsvrVal);
                    string resolvedEnvVars = Environment.ExpandEnvironmentVariables(inprocsvrStr);
                    string path = resolvedEnvVars.Trim('"');

                    if (path != null)
                        {
                            if (!File.Exists(path)) 
                            {
                                object clsidVal = queryObj["ComponentID"];
                                string clsidStr = Convert.ToString(clsidVal);
                                string missingKey = path + "," + clsidStr;
                                if (missingKey.StartsWith("C:")) //This filters out things like combase.dll
                                    inprocsvr32.Add(missingKey);
                            }                            
                        }
                }
                
                List<string> distinct = inprocsvr32.Distinct().ToList();
                List<string> cleanList = distinct.Where(s => !string.IsNullOrWhiteSpace(s)).Distinct().ToList();
                foreach (string dll in cleanList) { Console.WriteLine(dll); }
                Console.ReadKey();
            }
            catch (ManagementException e)
            {
                Console.WriteLine("An error occurred while querying for WMI data: " + e.Message);
            }
        }
    }
}