diff --git a/projects/langs.vcproj b/projects/langs.vcproj
index 1d04ccbe74..57683ebe76 100644
--- a/projects/langs.vcproj
+++ b/projects/langs.vcproj
@@ -305,30 +305,30 @@
 			</FileConfiguration>
 		</File>
 		<File
-			RelativePath="..\src\lang\norwegian-bokmal.txt"
+			RelativePath="..\src\lang\norwegian_bokmal.txt"
 			>
 			<FileConfiguration
 				Name="Debug|Win32">
 				<Tool
 					Name="VCCustomBuildTool"
-					Description="Generating norwegian-bokmal language file"
+					Description="Generating norwegian_bokmal language file"
 					CommandLine="..\objs\strgen\strgen.exe -s ..\src\lang -d ..\bin\lang &quot;$(InputPath)&quot;&#x0D;&#x0A;"
 					AdditionalDependencies=""
-					Outputs="..\bin\lang\norwegian-bokmal.lng"
+					Outputs="..\bin\lang\norwegian_bokmal.lng"
 				/>
 			</FileConfiguration>
 		</File>
 		<File
-			RelativePath="..\src\lang\norwegian-nynorsk.txt"
+			RelativePath="..\src\lang\norwegian_nynorsk.txt"
 			>
 			<FileConfiguration
 				Name="Debug|Win32">
 				<Tool
 					Name="VCCustomBuildTool"
-					Description="Generating norwegian-nynorsk language file"
+					Description="Generating norwegian_nynorsk language file"
 					CommandLine="..\objs\strgen\strgen.exe -s ..\src\lang -d ..\bin\lang &quot;$(InputPath)&quot;&#x0D;&#x0A;"
 					AdditionalDependencies=""
-					Outputs="..\bin\lang\norwegian-nynorsk.lng"
+					Outputs="..\bin\lang\norwegian_nynorsk.lng"
 				/>
 			</FileConfiguration>
 		</File>
diff --git a/projects/langs_vs80.vcproj b/projects/langs_vs80.vcproj
index 3f7468f8ce..41dc82be6c 100644
--- a/projects/langs_vs80.vcproj
+++ b/projects/langs_vs80.vcproj
@@ -313,30 +313,30 @@
 			</FileConfiguration>
 		</File>
 		<File
-			RelativePath="..\src\lang\norwegian-bokmal.txt"
+			RelativePath="..\src\lang\norwegian_bokmal.txt"
 			>
 			<FileConfiguration
 				Name="Debug|Win32">
 				<Tool
 					Name="VCCustomBuildTool"
-					Description="Generating norwegian-bokmal language file"
+					Description="Generating norwegian_bokmal language file"
 					CommandLine="..\objs\strgen\strgen.exe -s ..\src\lang -d ..\bin\lang &quot;$(InputPath)&quot;&#x0D;&#x0A;"
 					AdditionalDependencies=""
-					Outputs="..\bin\lang\norwegian-bokmal.lng"
+					Outputs="..\bin\lang\norwegian_bokmal.lng"
 				/>
 			</FileConfiguration>
 		</File>
 		<File
-			RelativePath="..\src\lang\norwegian-nynorsk.txt"
+			RelativePath="..\src\lang\norwegian_nynorsk.txt"
 			>
 			<FileConfiguration
 				Name="Debug|Win32">
 				<Tool
 					Name="VCCustomBuildTool"
-					Description="Generating norwegian-nynorsk language file"
+					Description="Generating norwegian_nynorsk language file"
 					CommandLine="..\objs\strgen\strgen.exe -s ..\src\lang -d ..\bin\lang &quot;$(InputPath)&quot;&#x0D;&#x0A;"
 					AdditionalDependencies=""
-					Outputs="..\bin\lang\norwegian-nynorsk.lng"
+					Outputs="..\bin\lang\norwegian_nynorsk.lng"
 				/>
 			</FileConfiguration>
 		</File>
diff --git a/src/lang/norwegian-bokmal.txt b/src/lang/norwegian_bokmal.txt
similarity index 100%
rename from src/lang/norwegian-bokmal.txt
rename to src/lang/norwegian_bokmal.txt
diff --git a/src/lang/norwegian-nynorsk.txt b/src/lang/norwegian_nynorsk.txt
similarity index 100%
rename from src/lang/norwegian-nynorsk.txt
rename to src/lang/norwegian_nynorsk.txt