--- a/openttd.vcproj	Wed Sep 27 16:07:07 2006 +0000
+++ b/openttd.vcproj	Wed Sep 27 18:17:01 2006 +0000
@@ -304,6 +304,9 @@
 				RelativePath=".\newgrf_engine.c">
 			</File>
 			<File
+				RelativePath=".\newgrf_sound.c">
+			</File>
+			<File
 				RelativePath=".\newgrf_spritegroup.c">
 			</File>
 			<File
@@ -551,6 +554,9 @@
 				RelativePath=".\newgrf_engine.h">
 			</File>
 			<File
+				RelativePath=".\newgrf_sound.h">
+			</File>
+			<File
 				RelativePath=".\newgrf_spritegroup.h">
 			</File>
 			<File