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Basic formatting applied. Unnecessary comments have been removed. Suspicious code is covered by TODO.

Hcs.Client/ClientApi/HcsFile.cs

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+using System;
+using System.IO;
+using System.Linq;
+
+namespace Hcs.ClientApi
+{
+    public class HcsFile
+    {
+        public string FileName { get; private set; }
+        public string ContentType { get; private set; }
+        public Stream Stream { get; private set; }
+
+        public long Length => Stream.Length;
+
+        public HcsFile(string fileName, string contentType, Stream stream)
+        {
+            FileName = fileName;
+            ContentType = contentType ?? throw new ArgumentNullException(nameof(ContentType));
+            Stream = stream ?? throw new ArgumentNullException(nameof(stream));
+        }
+
+        /// <summary>
+        /// По имени файла возвращает строку MIME Content-Type или null если тип MIME не найден
+        /// </summary>
+        public static string GetMimeContentTypeForFileName(string fileName)
+        {
+            if (string.IsNullOrEmpty(fileName)) return null;
+            string extension = Path.GetExtension(fileName).ToLower();
+            var mimeType = AllowedMimeTypes.FirstOrDefault(x => x.Extension == extension);
+            if (mimeType == null) return null;
+            return mimeType.ContentType;
+        }
+
+        public record struct MimeType(string Extension, string ContentType);
+
+        /// <summary>
+        /// Типы MIME допустимые для загрузки в ГИС ЖКХ
+        /// </summary>
+        public static MimeType[] AllowedMimeTypes =
+        {
+           new MimeType(".pdf", "application/pdf"),
+           new MimeType(".xls", "application/excel"),
+           new MimeType(".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"),
+           new MimeType(".doc", "application/msword"),
+           new MimeType(".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"),
+           new MimeType(".rtf", "application/rtf"),
+           new MimeType(".jpg", "image/jpeg"),
+           new MimeType(".jpeg", "image/jpeg"),
+           new MimeType(".tif", "image/tiff"),
+           new MimeType(".tiff", "image/tiff")
+           // TODO: Проверить комментарий
+           // В спецификации есть другие типы файлов .zip, .sgn и т.д.
+        };
+    }
+}