diff --git a/src/Main/Base/Project/Src/Internal/Undo/MSBuildFile.cs b/src/Main/Base/Project/Src/Internal/Undo/MSBuildFile.cs
new file mode 100644
index 0000000000..2b259db89a
--- /dev/null
+++ b/src/Main/Base/Project/Src/Internal/Undo/MSBuildFile.cs
@@ -0,0 +1,169 @@
+// <file>
+//     <copyright see="prj:///doc/copyright.txt">2002-2005 AlphaSierraPapa</copyright>
+//     <license see="prj:///doc/license.txt">GNU General Public License</license>
+//     <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
+//     <version>$Revision: 562 $</version>
+// </file>
+
+using System;
+using System.CodeDom.Compiler;
+using System.Diagnostics;
+using System.IO;
+using System.Globalization;
+using System.Collections.Generic;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Xml;
+using System.Xml.Xsl;
+using ICSharpCode.Core;
+using ICSharpCode.SharpDevelop.Internal.Templates;
+using ICSharpCode.SharpDevelop.Gui;
+
+namespace ICSharpCode.SharpDevelop.Project
+{
+	// Summary:
+	// Represents a reader that reads MSBuild files converting the MSBuild specific escape %25 to %
+	public class MSBuildFileReader : XmlTextReader
+	{
+		private string Convert(string instr)
+		{
+			if (instr != null && instr.Contains("%25")) {
+				return instr.Replace("%25", "%");
+			}
+			return instr;
+		}
+		public MSBuildFileReader(string fileName) : base(fileName) { }
+		public MSBuildFileReader(TextReader r) : base(r) { }
+		//
+		// Summary:
+		// Gets the value of the attribute with the specified index.
+		// 
+		// Parameters:
+		// i: 
+		//    The index of the attribute. The index is zero-based. (The first attribute
+		//    has index 0.) 
+		// 
+		// Returns:
+		// The value of the specified attribute.
+		// 
+		// Exceptions:
+		//    System.ArgumentOutOfRangeException
+		// 
+		public override string GetAttribute(int i)
+		{
+			return Convert(base.GetAttribute(i));
+		}
+		//
+		// Summary:
+		// Gets the value of the attribute with the specified name.
+		// 
+		// Parameters:
+		// name: 
+		//    The qualified name of the attribute. 
+		// 
+		// Returns:
+		// The value of the specified attribute. If the attribute is not found, null is
+		// returned.
+		public override string GetAttribute(string name)
+		{
+			return Convert(base.GetAttribute(name));
+		}
+		//
+		// Summary:
+		// Gets the value of the attribute with the specified local name and namespace
+		// URI.
+		// 
+		// Parameters:
+		// localName: 
+		//    The local name of the attribute. 
+		// namespaceURI: 
+		//    The namespace URI of the attribute. 
+		// 
+		// Returns:
+		// The value of the specified attribute. If the attribute is not found, null is
+		// returned. This method does not move the reader.
+		public override string GetAttribute(string localName, string namespaceURI)
+		{
+			return Convert(base.GetAttribute(localName, namespaceURI));
+		}
+	}
+	// Summary:
+	// Represents a writer that writes MSBuild files converting the MSBuild specific escape % to %25
+	public class MSBuildFileWriter : XmlTextWriter
+	{
+		private string Convert(string instr)
+		{
+			if (instr != null && instr.Contains("%")) {
+				return instr.Replace("%", "%25");
+			}
+			return instr;
+		}
+		public MSBuildFileWriter(string fileName, Encoding encoding) : base(fileName, encoding) { }
+		//
+		// Summary:
+		// When overridden in a derived class, writes out the attribute with the
+		// specified local name and value.
+		// 
+		// Parameters:
+		// localName: 
+		//    The local name of the attribute. 
+		// value: 
+		//    The value of the attribute. 
+		// 
+		// Exceptions:
+		//    System.InvalidOperationException
+		// 
+		//    System.ArgumentException
+		// 
+		public new void WriteAttributeString(string localName, string value)
+		{
+			base.WriteAttributeString(localName, Convert(value));
+		}
+		//
+		// Summary:
+		// When overridden in a derived class, writes an attribute with the specified
+		// local name, namespace URI, and value.
+		// 
+		// Parameters:
+		// localName: 
+		//    The local name of the attribute. 
+		// value: 
+		//    The value of the attribute. 
+		// ns: 
+		//    The namespace URI to associate with the attribute. 
+		// 
+		// Exceptions:
+		//    System.InvalidOperationException
+		// 
+		//    System.ArgumentException
+		// 
+		public new void WriteAttributeString(string localName, string ns, string value)
+		{
+			base.WriteAttributeString(localName, ns, Convert(value));
+		}
+		//
+		// Summary:
+		// When overridden in a derived class, writes out the attribute with the
+		// specified prefix, local name, namespace URI, and value.
+		// 
+		// Parameters:
+		// localName: 
+		//    The local name of the attribute. 
+		// prefix: 
+		//    The namespace prefix of the attribute. 
+		// value: 
+		//    The value of the attribute. 
+		// ns: 
+		//    The namespace URI of the attribute. 
+		// 
+		// Exceptions:
+		//    System.InvalidOperationException
+		// 
+		//    System.ArgumentException
+		// 
+		public new void WriteAttributeString(string prefix, string localName, string ns, string value)
+		{
+			base.WriteAttributeString(prefix, localName, ns, Convert(value));
+		}
+	}
+}
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