diff --git a/projects/VC7.1/FlightGear.vcproj b/projects/VC7.1/FlightGear.vcproj
index 3231ab776..a4b57a9f7 100755
--- a/projects/VC7.1/FlightGear.vcproj
+++ b/projects/VC7.1/FlightGear.vcproj
@@ -2206,6 +2206,24 @@
 		<Filter
 			Name="Lib_Environment"
 			Filter="">
+			<File
+				RelativePath="..\..\src\Environment\atmosphere.cxx">
+				<FileConfiguration
+					Name="Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						ObjectFile="$(IntDir)/$(InputName)1.obj"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						ObjectFile="$(IntDir)/$(InputName)1.obj"/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\src\Environment\atmosphere.hxx">
+			</File>
 			<File
 				RelativePath="..\..\src\Environment\environment.cxx">
 			</File>
@@ -2332,12 +2350,6 @@
 			<File
 				RelativePath="..\..\src\Instrumentation\dme.hxx">
 			</File>
-			<File
-				RelativePath="..\..\src\Instrumentation\encoder.cxx">
-			</File>
-			<File
-				RelativePath="..\..\src\Instrumentation\encoder.hxx">
-			</File>
 			<File
 				RelativePath="..\..\src\Instrumentation\gps.cxx">
 			</File>