--- a/openttd.dsp	Sun Feb 05 19:46:20 2006 +0000
+++ b/openttd.dsp	Sun Feb 05 20:36:36 2006 +0000
@@ -626,6 +626,10 @@
 # End Source File
 # Begin Source File
 
+SOURCE=.\newgrf_callbacks.h
+# End Source File
+# Begin Source File
+
 SOURCE=.\newgrf_engine.h
 # End Source File
 # Begin Source File

--- a/openttd.vcproj	Sun Feb 05 19:46:20 2006 +0000
+++ b/openttd.vcproj	Sun Feb 05 20:36:36 2006 +0000
@@ -492,6 +492,9 @@
 				RelativePath=".\newgrf.h">
 			</File>
 			<File
+				RelativePath=".\newgrf_callbacks.h">
+			</File>
+			<File
 				RelativePath=".\newgrf_engine.h">
 			</File>
 			<File