Get active application and url of Word, Excel, Powerpoint, and PDF

gistfile1.cs

        private InfoItem GetActiveItemFromROT(IntPtr handle)
        {
            activeItem = new InfoItem();
            String activeTitle = GetActiveWindowText(handle);
            String title;

            IntPtr numFetched = IntPtr.Zero;
            IRunningObjectTable runningObjectTable;
            IEnumMoniker monikerEnumerator;
            IMoniker[] monikers = new IMoniker[1];

            GetRunningObjectTable(0, out runningObjectTable);
            runningObjectTable.EnumRunning(out monikerEnumerator);
            monikerEnumerator.Reset();

            while (monikerEnumerator.Next(1, monikers, numFetched) == 0)
            {
                IBindCtx ctx;
                CreateBindCtx(0, out ctx);

                string runningObjectName;
                monikers[0].GetDisplayName(ctx, null, out runningObjectName);

                object runningObjectVal;
                runningObjectTable.GetObject(monikers[0], out runningObjectVal);

                try
                {
                    string ext = Path.GetExtension(runningObjectName).ToLower();
                    if (ext == ".pdf" ||
                        ext == ".docx" || ext == ".doc" ||
                        ext == ".xlsx" || ext == ".xls" ||
                        ext == ".pptx" || ext == ".ppt")
                    {
                        title = Path.GetFileNameWithoutExtension(runningObjectName);
                        if (activeTitle.IndexOf(title) != -1)
                        {
                            activeItem.Title = Path.GetFileNameWithoutExtension(runningObjectName);
                            activeItem.Uri = runningObjectName;
                            activeItem.Type = InfoItemType.File;

                            return activeItem;
                        }

                    }
                }
                catch (Exception)
                {
                    continue;
                }
            }

            return null;
        }