Index: src/chext/chext.vc90.vcproj
===================================================================
diff -u -N -r0373359eff650e8cf04a5992711ef9f20347536f -r9352ed0c4fe447a36bc728640c307be6d41455fd
--- src/chext/chext.vc90.vcproj	(.../chext.vc90.vcproj)	(revision 0373359eff650e8cf04a5992711ef9f20347536f)
+++ src/chext/chext.vc90.vcproj	(.../chext.vc90.vcproj)	(revision 9352ed0c4fe447a36bc728640c307be6d41455fd)
@@ -55,6 +55,7 @@
 				ProgramDataBaseFileName="$(IntDir)\$(TargetName)_vs90.pdb"
 				BrowseInformation="0"
 				WarningLevel="4"
+				WarnAsError="true"
 				SuppressStartupBanner="true"
 				DebugInformationFormat="4"
 			/>
@@ -143,6 +144,7 @@
 				ProgramDataBaseFileName="$(IntDir)\$(TargetName)_vs90.pdb"
 				BrowseInformation="0"
 				WarningLevel="4"
+				WarnAsError="true"
 				SuppressStartupBanner="true"
 				DebugInformationFormat="3"
 			/>
@@ -232,6 +234,7 @@
 				ProgramDataBaseFileName="$(IntDir)\$(TargetName)_vs90.pdb"
 				BrowseInformation="0"
 				WarningLevel="4"
+				WarnAsError="true"
 				SuppressStartupBanner="true"
 				DebugInformationFormat="3"
 			/>
@@ -322,6 +325,7 @@
 				ProgramDataBaseFileName="$(IntDir)\$(TargetName)_vs90.pdb"
 				BrowseInformation="0"
 				WarningLevel="4"
+				WarnAsError="true"
 				SuppressStartupBanner="true"
 				DebugInformationFormat="3"
 			/>