diff --git a/projects/VC7.1/SimGear.vcproj b/projects/VC7.1/SimGear.vcproj
index 4a541cd8..172b5eb6 100755
--- a/projects/VC7.1/SimGear.vcproj
+++ b/projects/VC7.1/SimGear.vcproj
@@ -799,6 +799,15 @@
 			<File
 				RelativePath="..\..\simgear\scene\tgdb\SGOceanTile.hxx">
 			</File>
+			<File
+				RelativePath="..\..\simgear\scene\tgdb\SGReaderWriterBTG.cxx">
+			</File>
+			<File
+				RelativePath="..\..\simgear\scene\tgdb\SGReaderWriterBTG.hxx">
+			</File>
+			<File
+				RelativePath="..\..\simgear\scene\tgdb\SGReaderWriterBTGOptions.hxx">
+			</File>
 			<File
 				RelativePath="..\..\simgear\scene\tgdb\SGVasiDrawable.cxx">
 			</File>