Update location of Visual Studio project files.
diff --git a/win32/VisualC.txt b/win32/VisualC.txt
index 579a5fc..1005b21 100644
--- a/win32/VisualC.txt
+++ b/win32/VisualC.txt
@@ -1,3 +1,3 @@
 
 To build zlib using the Microsoft Visual C++ environment,
-use the appropriate project from the projects/ directory.
+use the appropriate project from the contrib/vstudio/ directory.