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diff --git a/src/mscorlib/src/System/IO/FileAccess.cs b/src/mscorlib/src/System/IO/FileAccess.cs
new file mode 100644
index 0000000000..f708a284c1
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+++ b/src/mscorlib/src/System/IO/FileAccess.cs
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*============================================================
+**
+** Enum:   FileAccess
+** 
+** 
+**
+**
+** Purpose: Enum describing whether you want read and/or write
+** permission to a file.
+**
+**
+===========================================================*/
+
+using System;
+
+namespace System.IO {
+    // Contains constants for specifying the access you want for a file.
+    // You can have Read, Write or ReadWrite access.
+    // 
+[Serializable]
+[Flags]
+[System.Runtime.InteropServices.ComVisible(true)]
+    public enum FileAccess
+    {
+        // Specifies read access to the file. Data can be read from the file and
+        // the file pointer can be moved. Combine with WRITE for read-write access.
+        Read = 1,
+    
+        // Specifies write access to the file. Data can be written to the file and
+        // the file pointer can be moved. Combine with READ for read-write access.
+        Write = 2,
+    
+        // Specifies read and write access to the file. Data can be written to the
+        // file and the file pointer can be moved. Data can also be read from the 
+        // file.
+        ReadWrite = 3,
+    }
+}