diff --git a/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj b/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
index 2d8cb71d4..99b6693f0 100644
--- a/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
+++ b/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
@@ -139,16 +139,16 @@
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-      <Project>{D68133BD-1E63-496E-9EDE-4FBDBF77B486}</Project>
+    <ProjectReference Include="..\cecil\Mono.Cecil.csproj" Condition=" '$(BuildNuGetPackage)' != 'True' ">
+      <Project>{d68133bd-1e63-496e-9ede-4fbdbf77b486}</Project>
       <Name>Mono.Cecil</Name>
     </ProjectReference>
-    <ProjectReference Include="..\NRefactory\ICSharpCode.NRefactory.CSharp\ICSharpCode.NRefactory.CSharp.csproj"  Condition=" '$(BuildNuGetPackage)' != 'True' ">
-      <Project>{53DCA265-3C3C-42F9-B647-F72BA678122B}</Project>
+    <ProjectReference Include="..\NRefactory\ICSharpCode.NRefactory.CSharp\ICSharpCode.NRefactory.CSharp.csproj" Condition=" '$(BuildNuGetPackage)' != 'True' ">
+      <Project>{53dca265-3c3c-42f9-b647-f72ba678122b}</Project>
       <Name>ICSharpCode.NRefactory.CSharp</Name>
     </ProjectReference>
     <ProjectReference Include="..\NRefactory\ICSharpCode.NRefactory\ICSharpCode.NRefactory.csproj" Condition=" '$(BuildNuGetPackage)' != 'True' ">
-      <Project>{3B2A5653-EC97-4001-BB9B-D90F1AF2C371}</Project>
+      <Project>{3b2a5653-ec97-4001-bb9b-d90f1af2c371}</Project>
       <Name>ICSharpCode.NRefactory</Name>
     </ProjectReference>
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diff --git a/ICSharpCode.Decompiler/Tests/ICSharpCode.Decompiler.Tests.csproj b/ICSharpCode.Decompiler/Tests/ICSharpCode.Decompiler.Tests.csproj
index adf4d5607..c7c0e05bb 100644
--- a/ICSharpCode.Decompiler/Tests/ICSharpCode.Decompiler.Tests.csproj
+++ b/ICSharpCode.Decompiler/Tests/ICSharpCode.Decompiler.Tests.csproj
@@ -112,19 +112,19 @@
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   <ItemGroup>
     <ProjectReference Include="..\..\cecil\Mono.Cecil.csproj">
-      <Project>{D68133BD-1E63-496E-9EDE-4FBDBF77B486}</Project>
+      <Project>{d68133bd-1e63-496e-9ede-4fbdbf77b486}</Project>
       <Name>Mono.Cecil</Name>
     </ProjectReference>
     <ProjectReference Include="..\..\NRefactory\ICSharpCode.NRefactory.CSharp\ICSharpCode.NRefactory.CSharp.csproj">
-      <Project>{53DCA265-3C3C-42F9-B647-F72BA678122B}</Project>
+      <Project>{53dca265-3c3c-42f9-b647-f72ba678122b}</Project>
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     <ProjectReference Include="..\..\NRefactory\ICSharpCode.NRefactory\ICSharpCode.NRefactory.csproj">
-      <Project>{3B2A5653-EC97-4001-BB9B-D90F1AF2C371}</Project>
+      <Project>{3b2a5653-ec97-4001-bb9b-d90f1af2c371}</Project>
       <Name>ICSharpCode.NRefactory</Name>
     </ProjectReference>
     <ProjectReference Include="..\ICSharpCode.Decompiler.csproj">
-      <Project>{984CC812-9470-4A13-AFF9-CC44068D666C}</Project>
+      <Project>{984cc812-9470-4a13-aff9-cc44068d666c}</Project>
       <Name>ICSharpCode.Decompiler</Name>
     </ProjectReference>
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diff --git a/ILSpy.BamlDecompiler/ILSpy.BamlDecompiler.csproj b/ILSpy.BamlDecompiler/ILSpy.BamlDecompiler.csproj
index 4dc0b3234..2abd844e5 100644
--- a/ILSpy.BamlDecompiler/ILSpy.BamlDecompiler.csproj
+++ b/ILSpy.BamlDecompiler/ILSpy.BamlDecompiler.csproj
@@ -101,27 +101,27 @@
   <ItemGroup />
   <ItemGroup>
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-      <Project>{6C55B776-26D4-4DB3-A6AB-87E783B2F3D1}</Project>
+      <Project>{6c55b776-26d4-4db3-a6ab-87e783b2f3d1}</Project>
       <Name>ICSharpCode.AvalonEdit</Name>
       <Private>False</Private>
     </ProjectReference>
     <ProjectReference Include="..\ICSharpCode.Decompiler\ICSharpCode.Decompiler.csproj">
-      <Project>{984CC812-9470-4A13-AFF9-CC44068D666C}</Project>
+      <Project>{984cc812-9470-4a13-aff9-cc44068d666c}</Project>
       <Name>ICSharpCode.Decompiler</Name>
       <Private>False</Private>
     </ProjectReference>
     <ProjectReference Include="..\ILSpy\ILSpy.csproj">
-      <Project>{1E85EFF9-E370-4683-83E4-8A3D063FF791}</Project>
+      <Project>{1e85eff9-e370-4683-83e4-8a3d063ff791}</Project>
       <Name>ILSpy</Name>
       <Private>False</Private>
     </ProjectReference>
     <ProjectReference Include="..\cecil\Mono.Cecil.csproj">
-      <Project>{D68133BD-1E63-496E-9EDE-4FBDBF77B486}</Project>
+      <Project>{d68133bd-1e63-496e-9ede-4fbdbf77b486}</Project>
       <Name>Mono.Cecil</Name>
       <Private>False</Private>
     </ProjectReference>
     <ProjectReference Include="..\SharpTreeView\ICSharpCode.TreeView.csproj">
-      <Project>{DDE2A481-8271-4EAC-A330-8FA6A38D13D1}</Project>
+      <Project>{dde2a481-8271-4eac-a330-8fa6a38d13d1}</Project>
       <Name>ICSharpCode.TreeView</Name>
       <Private>False</Private>
     </ProjectReference>
diff --git a/ILSpy.BamlDecompiler/Tests/ILSpy.BamlDecompiler.Tests.csproj b/ILSpy.BamlDecompiler/Tests/ILSpy.BamlDecompiler.Tests.csproj
index a4194f4f6..938d0ab27 100644
--- a/ILSpy.BamlDecompiler/Tests/ILSpy.BamlDecompiler.Tests.csproj
+++ b/ILSpy.BamlDecompiler/Tests/ILSpy.BamlDecompiler.Tests.csproj
@@ -97,23 +97,23 @@
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-      <Project>{FEC0DA52-C4A6-4710-BE36-B484A20C5E22}</Project>
+      <Project>{fec0da52-c4a6-4710-be36-b484a20c5e22}</Project>
       <Name>ICSharpCode.Decompiler.Tests</Name>
     </ProjectReference>
     <ProjectReference Include="..\..\ILSpy\ILSpy.csproj">
-      <Project>{1E85EFF9-E370-4683-83E4-8A3D063FF791}</Project>
+      <Project>{1e85eff9-e370-4683-83e4-8a3d063ff791}</Project>
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     </ProjectReference>
     <ProjectReference Include="..\..\cecil\Mono.Cecil.csproj">
-      <Project>{D68133BD-1E63-496E-9EDE-4FBDBF77B486}</Project>
+      <Project>{d68133bd-1e63-496e-9ede-4fbdbf77b486}</Project>
       <Name>Mono.Cecil</Name>
     </ProjectReference>
     <ProjectReference Include="..\..\SharpTreeView\ICSharpCode.TreeView.csproj">
-      <Project>{DDE2A481-8271-4EAC-A330-8FA6A38D13D1}</Project>
+      <Project>{dde2a481-8271-4eac-a330-8fa6a38d13d1}</Project>
       <Name>ICSharpCode.TreeView</Name>
     </ProjectReference>
     <ProjectReference Include="..\ILSpy.BamlDecompiler.csproj">
-      <Project>{A6BAD2BA-76BA-461C-8B6D-418607591247}</Project>
+      <Project>{a6bad2ba-76ba-461c-8b6d-418607591247}</Project>
       <Name>ILSpy.BamlDecompiler</Name>
     </ProjectReference>
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diff --git a/ILSpy.sln b/ILSpy.sln
index ff5451085..dad0c93a0 100644
--- a/ILSpy.sln
+++ b/ILSpy.sln
@@ -1,6 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 14
+# Visual Studio 2012
+# SharpDevelop 5.1
 VisualStudioVersion = 14.0.24720.0
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "doc", "doc", "{F45DB999-7E72-4000-B5AD-3A7B485A0896}"
diff --git a/ILSpy/ILSpy.csproj b/ILSpy/ILSpy.csproj
index 205afba41..5c6e84f5d 100644
--- a/ILSpy/ILSpy.csproj
+++ b/ILSpy/ILSpy.csproj
@@ -367,35 +367,35 @@
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-      <Project>{984CC812-9470-4A13-AFF9-CC44068D666C}</Project>
+      <Project>{984cc812-9470-4a13-aff9-cc44068d666c}</Project>
       <Name>ICSharpCode.Decompiler</Name>
     </ProjectReference>
     <ProjectReference Include="..\cecil\Mono.Cecil.csproj">
-      <Project>{D68133BD-1E63-496E-9EDE-4FBDBF77B486}</Project>
+      <Project>{d68133bd-1e63-496e-9ede-4fbdbf77b486}</Project>
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-      <Project>{6C55B776-26D4-4DB3-A6AB-87E783B2F3D1}</Project>
+      <Project>{6c55b776-26d4-4db3-a6ab-87e783b2f3d1}</Project>
       <Name>ICSharpCode.AvalonEdit</Name>
     </ProjectReference>
     <ProjectReference Include="..\cecil\symbols\pdb\Mono.Cecil.Pdb.csproj">
-      <Project>{63E6915C-7EA4-4D76-AB28-0D7191EEA626}</Project>
+      <Project>{63e6915c-7ea4-4d76-ab28-0d7191eea626}</Project>
       <Name>Mono.Cecil.Pdb</Name>
     </ProjectReference>
     <ProjectReference Include="..\NRefactory.VB\ICSharpCode.NRefactory.VB\ICSharpCode.NRefactory.VB.csproj">
-      <Project>{7B82B671-419F-45F4-B778-D9286F996EFA}</Project>
+      <Project>{7b82b671-419f-45f4-b778-d9286f996efa}</Project>
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-      <Project>{53DCA265-3C3C-42F9-B647-F72BA678122B}</Project>
+      <Project>{53dca265-3c3c-42f9-b647-f72ba678122b}</Project>
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-      <Project>{3B2A5653-EC97-4001-BB9B-D90F1AF2C371}</Project>
+      <Project>{3b2a5653-ec97-4001-bb9b-d90f1af2c371}</Project>
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     <ProjectReference Include="..\SharpTreeView\ICSharpCode.TreeView.csproj">
-      <Project>{DDE2A481-8271-4EAC-A330-8FA6A38D13D1}</Project>
+      <Project>{dde2a481-8271-4eac-a330-8fa6a38d13d1}</Project>
       <Name>ICSharpCode.TreeView</Name>
     </ProjectReference>
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diff --git a/NRefactory.VB/ICSharpCode.NRefactory.VB.Tests/ICSharpCode.NRefactory.VB.Tests.csproj b/NRefactory.VB/ICSharpCode.NRefactory.VB.Tests/ICSharpCode.NRefactory.VB.Tests.csproj
index 583a8acae..53e04c07e 100644
--- a/NRefactory.VB/ICSharpCode.NRefactory.VB.Tests/ICSharpCode.NRefactory.VB.Tests.csproj
+++ b/NRefactory.VB/ICSharpCode.NRefactory.VB.Tests/ICSharpCode.NRefactory.VB.Tests.csproj
@@ -94,11 +94,11 @@
   </ItemGroup>
   <ItemGroup>
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-      <Project>{7B82B671-419F-45F4-B778-D9286F996EFA}</Project>
+      <Project>{7b82b671-419f-45f4-b778-d9286f996efa}</Project>
       <Name>ICSharpCode.NRefactory.VB</Name>
     </ProjectReference>
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-      <Project>{3B2A5653-EC97-4001-BB9B-D90F1AF2C371}</Project>
+      <Project>{3b2a5653-ec97-4001-bb9b-d90f1af2c371}</Project>
       <Name>ICSharpCode.NRefactory</Name>
     </ProjectReference>
   </ItemGroup>
diff --git a/NRefactory.VB/ICSharpCode.NRefactory.VB/ICSharpCode.NRefactory.VB.csproj b/NRefactory.VB/ICSharpCode.NRefactory.VB/ICSharpCode.NRefactory.VB.csproj
index 5c75126ba..44e599d12 100644
--- a/NRefactory.VB/ICSharpCode.NRefactory.VB/ICSharpCode.NRefactory.VB.csproj
+++ b/NRefactory.VB/ICSharpCode.NRefactory.VB/ICSharpCode.NRefactory.VB.csproj
@@ -211,11 +211,11 @@
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   <ItemGroup>
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-      <Project>{53DCA265-3C3C-42F9-B647-F72BA678122B}</Project>
+      <Project>{53dca265-3c3c-42f9-b647-f72ba678122b}</Project>
       <Name>ICSharpCode.NRefactory.CSharp</Name>
     </ProjectReference>
     <ProjectReference Include="..\..\NRefactory\ICSharpCode.NRefactory\ICSharpCode.NRefactory.csproj">
-      <Project>{3B2A5653-EC97-4001-BB9B-D90F1AF2C371}</Project>
+      <Project>{3b2a5653-ec97-4001-bb9b-d90f1af2c371}</Project>
       <Name>ICSharpCode.NRefactory</Name>
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   </ItemGroup>
diff --git a/TestPlugin/TestPlugin.csproj b/TestPlugin/TestPlugin.csproj
index dc2e78f56..38230e7a8 100644
--- a/TestPlugin/TestPlugin.csproj
+++ b/TestPlugin/TestPlugin.csproj
@@ -83,27 +83,27 @@
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\ICSharpCode.Decompiler\ICSharpCode.Decompiler.csproj">
-      <Project>{984CC812-9470-4A13-AFF9-CC44068D666C}</Project>
+      <Project>{984cc812-9470-4a13-aff9-cc44068d666c}</Project>
       <Name>ICSharpCode.Decompiler</Name>
     </ProjectReference>
     <ProjectReference Include="..\ILSpy\ILSpy.csproj">
-      <Project>{1E85EFF9-E370-4683-83E4-8A3D063FF791}</Project>
+      <Project>{1e85eff9-e370-4683-83e4-8a3d063ff791}</Project>
       <Name>ILSpy</Name>
     </ProjectReference>
     <ProjectReference Include="..\cecil\Mono.Cecil.csproj">
-      <Project>{D68133BD-1E63-496E-9EDE-4FBDBF77B486}</Project>
+      <Project>{d68133bd-1e63-496e-9ede-4fbdbf77b486}</Project>
       <Name>Mono.Cecil</Name>
     </ProjectReference>
     <ProjectReference Include="..\NRefactory\ICSharpCode.NRefactory.CSharp\ICSharpCode.NRefactory.CSharp.csproj">
-      <Project>{53DCA265-3C3C-42F9-B647-F72BA678122B}</Project>
+      <Project>{53dca265-3c3c-42f9-b647-f72ba678122b}</Project>
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-      <Project>{3B2A5653-EC97-4001-BB9B-D90F1AF2C371}</Project>
+      <Project>{3b2a5653-ec97-4001-bb9b-d90f1af2c371}</Project>
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     <ProjectReference Include="..\SharpTreeView\ICSharpCode.TreeView.csproj">
-      <Project>{DDE2A481-8271-4EAC-A330-8FA6A38D13D1}</Project>
+      <Project>{dde2a481-8271-4eac-a330-8fa6a38d13d1}</Project>
       <Name>ICSharpCode.TreeView</Name>
     </ProjectReference>
   </ItemGroup>