Added example.

OnlineEditorsExample/OnlineEditorsExampleMVC/Models/FileUtility.cs

@@ -0,0 +1,45 @@
+using System.Collections.Generic;
+using System.IO;
+
+namespace OnlineEditorsExampleMVC.Models
+{
+    public static class FileUtility
+    {
+        public enum FileType
+        {
+            Text,
+            Spreadsheet,
+            Presentation
+        }
+
+        public static FileType GetFileType(string fileName)
+        {
+            var ext = Path.GetExtension(fileName).ToLower();
+
+            if (ExtsDocument.Contains(ext)) return FileType.Text;
+            if (ExtsSpreadsheet.Contains(ext)) return FileType.Spreadsheet;
+            if (ExtsPresentation.Contains(ext)) return FileType.Presentation;
+
+            return FileType.Text;
+        }
+
+        public static readonly List<string> ExtsDocument = new List<string>
+            {
+                ".docx", ".doc", ".odt", ".rtf", ".txt",
+                ".html", ".htm", ".mht", ".pdf", ".djvu",
+                ".fb2", ".epub", ".xps"
+            };
+
+        public static readonly List<string> ExtsSpreadsheet = new List<string>
+            {
+                ".xls", ".xlsx",
+                ".ods", ".csv"
+            };
+
+        public static readonly List<string> ExtsPresentation = new List<string>
+            {
+                ".ppt", ".pptx",
+                ".odp"
+            };
+    }
+}