diff --git a/src/StepMania-net2008.vcproj b/src/StepMania-net2008.vcproj
index 6f0bd4bf78..3b2db7bb86 100644
--- a/src/StepMania-net2008.vcproj
+++ b/src/StepMania-net2008.vcproj
@@ -1172,6 +1172,14 @@
 				RelativePath="CryptHelpers.h"
 				>
 			</File>
+			<File
+				RelativePath="CubicSpline.cpp"
+				>
+			</File>
+			<File
+				RelativePath="CubicSpline.h"
+				>
+			</File>
 			<File
 				RelativePath="DateTime.cpp"
 				>
diff --git a/src/StepMania-net2010.vcxproj b/src/StepMania-net2010.vcxproj
index a296a39375..069634fca2 100644
--- a/src/StepMania-net2010.vcxproj
+++ b/src/StepMania-net2010.vcxproj
@@ -442,6 +442,7 @@ cl /Zl /nologo /c verstub.cpp /Fo$(IntDir)</Command>
     <ClCompile Include="ControllerStateDisplay.cpp" />
     <ClCompile Include="CreateZip.cpp" />
     <ClCompile Include="CryptHelpers.cpp" />
+    <ClCompile Include="CubicSpline.cpp" />
     <ClCompile Include="DateTime.cpp" />
     <ClCompile Include="Difficulty.cpp" />
     <ClCompile Include="EnumHelper.cpp" />
@@ -1757,6 +1758,7 @@ cl /Zl /nologo /c verstub.cpp /Fo$(IntDir)</Command>
     <ClInclude Include="ControllerStateDisplay.h" />
     <ClInclude Include="CreateZip.h" />
     <ClInclude Include="CryptHelpers.h" />
+    <ClInclude Include="CubicSpline.h" />
     <ClInclude Include="DateTime.h" />
     <ClInclude Include="Difficulty.h" />
     <ClInclude Include="EnumHelper.h" />
diff --git a/src/StepMania-net2010.vcxproj.filters b/src/StepMania-net2010.vcxproj.filters
index 94642bc4c2..95f0ef1d3c 100644
--- a/src/StepMania-net2010.vcxproj.filters
+++ b/src/StepMania-net2010.vcxproj.filters
@@ -381,6 +381,9 @@
     <ClCompile Include="CryptHelpers.cpp">
       <Filter>Data Structures</Filter>
     </ClCompile>
+    <ClCompile Include="CubicSpline.cpp">
+      <Filter>Data Structures</Filter>
+    </ClCompile>
     <ClCompile Include="DateTime.cpp">
       <Filter>Data Structures</Filter>
     </ClCompile>
@@ -1886,6 +1889,9 @@
     <ClInclude Include="CryptHelpers.h">
       <Filter>Data Structures</Filter>
     </ClInclude>
+    <ClInclude Include="CubicSpline.h">
+      <Filter>Data Structures</Filter>
+    </ClInclude>
     <ClInclude Include="DateTime.h">
       <Filter>Data Structures</Filter>
     </ClInclude>
diff --git a/src/StepMania-net2011.vcxproj b/src/StepMania-net2011.vcxproj
index 1424c89ba2..c487cda738 100644
--- a/src/StepMania-net2011.vcxproj
+++ b/src/StepMania-net2011.vcxproj
@@ -468,6 +468,7 @@ cl /Zl /nologo /c verstub.cpp /Fo"$(IntDir)"</Command>
     <ClCompile Include="ControllerStateDisplay.cpp" />
     <ClCompile Include="CreateZip.cpp" />
     <ClCompile Include="CryptHelpers.cpp" />
+    <ClCompile Include="CubicSpline.cpp" />
     <ClCompile Include="DateTime.cpp" />
     <ClCompile Include="Difficulty.cpp" />
     <ClCompile Include="EnumHelper.cpp" />
@@ -1343,6 +1344,7 @@ cl /Zl /nologo /c verstub.cpp /Fo"$(IntDir)"</Command>
     <ClInclude Include="ControllerStateDisplay.h" />
     <ClInclude Include="CreateZip.h" />
     <ClInclude Include="CryptHelpers.h" />
+    <ClInclude Include="CubicSpline.h" />
     <ClInclude Include="DateTime.h" />
     <ClInclude Include="Difficulty.h" />
     <ClInclude Include="EnumHelper.h" />
diff --git a/src/StepMania-net2011.vcxproj.filters b/src/StepMania-net2011.vcxproj.filters
index b230a7d580..3af88b8911 100644
--- a/src/StepMania-net2011.vcxproj.filters
+++ b/src/StepMania-net2011.vcxproj.filters
@@ -369,6 +369,9 @@
     <ClCompile Include="CryptHelpers.cpp">
       <Filter>Data Structures</Filter>
     </ClCompile>
+    <ClCompile Include="CubicSpline.cpp">
+      <Filter>Data Structures</Filter>
+    </ClCompile>
     <ClCompile Include="DateTime.cpp">
       <Filter>Data Structures</Filter>
     </ClCompile>
@@ -1724,6 +1727,9 @@
     <ClInclude Include="CryptHelpers.h">
       <Filter>Data Structures</Filter>
     </ClInclude>
+    <ClInclude Include="CubicSpline.h">
+      <Filter>Data Structures</Filter>
+    </ClInclude>
     <ClInclude Include="DateTime.h">
       <Filter>Data Structures</Filter>
     </ClInclude>
diff --git a/src/StepMania-net2013.vcxproj b/src/StepMania-net2013.vcxproj
index 48656c83cd..97030ffe11 100644
--- a/src/StepMania-net2013.vcxproj
+++ b/src/StepMania-net2013.vcxproj
@@ -467,6 +467,7 @@ cl /Zl /nologo /c verstub.cpp /Fo"$(IntDir)"</Command>
     <ClCompile Include="ControllerStateDisplay.cpp" />
     <ClCompile Include="CreateZip.cpp" />
     <ClCompile Include="CryptHelpers.cpp" />
+    <ClCompile Include="CubicSpline.cpp" />
     <ClCompile Include="DateTime.cpp" />
     <ClCompile Include="Difficulty.cpp" />
     <ClCompile Include="EnumHelper.cpp" />
@@ -1782,6 +1783,7 @@ cl /Zl /nologo /c verstub.cpp /Fo"$(IntDir)"</Command>
     <ClInclude Include="ControllerStateDisplay.h" />
     <ClInclude Include="CreateZip.h" />
     <ClInclude Include="CryptHelpers.h" />
+    <ClInclude Include="CubicSpline.h" />
     <ClInclude Include="DateTime.h" />
     <ClInclude Include="Difficulty.h" />
     <ClInclude Include="EnumHelper.h" />
diff --git a/src/StepMania-net2013.vcxproj.filters b/src/StepMania-net2013.vcxproj.filters
index 561138996c..de46cf7d7b 100644
--- a/src/StepMania-net2013.vcxproj.filters
+++ b/src/StepMania-net2013.vcxproj.filters
@@ -381,6 +381,9 @@
     <ClCompile Include="CryptHelpers.cpp">
       <Filter>Data Structures</Filter>
     </ClCompile>
+    <ClCompile Include="CubicSpline.cpp">
+      <Filter>Data Structures</Filter>
+    </ClCompile>
     <ClCompile Include="DateTime.cpp">
       <Filter>Data Structures</Filter>
     </ClCompile>
@@ -1886,6 +1889,9 @@
     <ClInclude Include="CryptHelpers.h">
       <Filter>Data Structures</Filter>
     </ClInclude>
+    <ClInclude Include="CubicSpline.h">
+      <Filter>Data Structures</Filter>
+    </ClInclude>
     <ClInclude Include="DateTime.h">
       <Filter>Data Structures</Filter>
     </ClInclude>