Find all .xls files in C#

findxls.cs

        public IList<Documents> FindDocuments()
        {
            DriveInfo[] allDrives = DriveInfo.GetDrives();

            IList<Documents> documentsList = new List<Documents>();

            foreach (DriveInfo d in allDrives)
            {
                foreach (var file in Directory.GetFiles(d.ToString(), "*.xls", SearchOption.AllDirectories))
                {
                    Documents documents = new Documents();
                    documents.FilePath = file;
                    documentsList.Add(documents);
                }
            }
            return documentsList;
        }