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diff --git a/src/WixToolset.Extensibility/Data/IFileFacade.cs b/src/WixToolset.Extensibility/Data/IFileFacade.cs
new file mode 100644
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+++ b/src/WixToolset.Extensibility/Data/IFileFacade.cs
@@ -0,0 +1,126 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Extensibility.Data
+{
+    using System.Collections.Generic;
+    using WixToolset.Data;
+    using WixToolset.Data.Symbols;
+    using WixToolset.Data.WindowsInstaller.Rows;
+
+    /// <summary>
+    /// Interface that provides a common facade over <c>FileSymbol</c> and <c>FileRow</c>.
+    /// </summary>
+    public interface IFileFacade
+    {
+        /// <summary>
+        /// Reference to assembly application for this file.
+        /// </summary>
+        string AssemblyApplicationFileRef { get; }
+
+        /// <summary>
+        /// Reference to assembly manifest for this file.
+        /// </summary>
+        string AssemblyManifestFileRef { get; }
+
+        /// <summary>
+        /// List of assembly name values in the file.
+        /// </summary>
+        List<MsiAssemblyNameSymbol> AssemblyNames { get; set; }
+
+        /// <summary>
+        /// Optionally indicates what sort of assembly the file is.
+        /// </summary>
+        AssemblyType? AssemblyType { get; }
+
+        /// <summary>
+        /// Component containing the file.
+        /// </summary>
+        string ComponentRef { get; }
+
+        /// <summary>
+        /// Indicates whether the file is compressed.
+        /// </summary>
+        bool Compressed { get; }
+
+        /// <summary>
+        /// Disk Id for the file.
+        /// </summary>
+        int DiskId { get; set; }
+
+        /// <summary>
+        /// Name of the file.
+        /// </summary>
+        string FileName { get; }
+
+        /// <summary>
+        /// Size of the file.
+        /// </summary>
+        int FileSize { get; set; }
+
+        /// <summary>
+        /// Indicates whether the file came from a merge module.
+        /// </summary>
+        bool FromModule { get; }
+
+        /// <summary>
+        /// Indicates whether the file came from a transform.
+        /// </summary>
+        bool FromTransform { get; }
+
+        /// <summary>
+        /// Hash symbol of the file.
+        /// </summary>
+        MsiFileHashSymbol Hash { get; set; }
+
+        /// <summary>
+        /// Underlying identifier of the file.
+        /// </summary>
+        Identifier Identifier { get; }
+
+        /// <summary>
+        /// Helper accessor for the Id of the Identifier.
+        /// </summary>
+        string Id { get; }
+
+        /// <summary>
+        /// Language of the file.
+        /// </summary>
+        string Language { get; set; }
+
+        /// <summary>
+        /// Optional patch group for the file.
+        /// </summary>
+        int? PatchGroup { get; }
+
+        /// <summary>
+        /// Sequence of the file.
+        /// </summary>
+        int Sequence { get; set; }
+
+        /// <summary>
+        /// Source line number that define the file.
+        /// </summary>
+        SourceLineNumber SourceLineNumber { get; }
+
+        /// <summary>
+        /// Source to the file.
+        /// </summary>
+        string SourcePath { get; }
+
+        /// <summary>
+        /// Indicates whether the file is to be uncompressed.
+        /// </summary>
+        bool Uncompressed { get; }
+
+        /// <summary>
+        /// Version of the file.
+        /// </summary>
+        string Version { get; set; }
+
+        /// <summary>
+        /// Gets the underlying <c>FileRow</c> if one is present.
+        /// </summary>
+        /// <returns><c>FileRow</c> if one is present, otherwise throws.</returns>
+        FileRow GetFileRow();
+    }
+}