diff --git a/stepmania/src/StepMania.dsp b/stepmania/src/StepMania.dsp
index 8b32a4b607..169b9e4363 100644
--- a/stepmania/src/StepMania.dsp
+++ b/stepmania/src/StepMania.dsp
@@ -252,6 +252,14 @@ SOURCE=.\RageFileDriver.h
 # End Source File
 # Begin Source File
 
+SOURCE=.\RageFileDriverDeflate.cpp
+# End Source File
+# Begin Source File
+
+SOURCE=.\RageFileDriverDeflate.h
+# End Source File
+# Begin Source File
+
 SOURCE=.\RageFileDriverDirect.cpp
 # End Source File
 # Begin Source File
@@ -276,6 +284,14 @@ SOURCE=.\RageFileDriverMemory.h
 # End Source File
 # Begin Source File
 
+SOURCE=.\RageFileDriverSlice.cpp
+# End Source File
+# Begin Source File
+
+SOURCE=.\RageFileDriverSlice.h
+# End Source File
+# Begin Source File
+
 SOURCE=.\RageFileDriverZip.cpp
 # End Source File
 # Begin Source File