Hopefully added _fileio module to the Windows build system
diff --git a/PCbuild/pythoncore.vcproj b/PCbuild/pythoncore.vcproj
index b02703a..3d3601a 100644
--- a/PCbuild/pythoncore.vcproj
+++ b/PCbuild/pythoncore.vcproj
@@ -987,6 +987,10 @@
 				>
 			</File>
 			<File
+				RelativePath="..\Modules\_fileio.c"
+				>
+			</File>
+			<File
 				RelativePath="..\Modules\_functoolsmodule.c"
 				>
 			</File>