fix vs build

windows/LightGBM.vcxproj

@@ -208,6 +208,7 @@
     <ClInclude Include="..\include\LightGBM\tree_learner.h" />
     <ClInclude Include="..\include\LightGBM\utils\array_args.h" />
     <ClInclude Include="..\include\LightGBM\utils\common.h" />
+    <ClInclude Include="..\include\LightGBM\utils\file_io.h" />
     <ClInclude Include="..\include\LightGBM\utils\log.h" />
     <ClInclude Include="..\include\LightGBM\utils\openmp_wrapper.h" />
     <ClInclude Include="..\include\LightGBM\utils\pipeline_reader.h" />
@@ -257,6 +258,7 @@
     <ClCompile Include="..\src\io\config.cpp" />
     <ClCompile Include="..\src\io\dataset.cpp" />
     <ClCompile Include="..\src\io\dataset_loader.cpp" />
+    <ClCompile Include="..\src\io\file_io.cpp" />
     <ClCompile Include="..\src\io\metadata.cpp" />
     <ClCompile Include="..\src\io\parser.cpp" />
     <ClCompile Include="..\src\io\tree.cpp" />

windows/LightGBM.vcxproj.filters

@@ -201,6 +201,9 @@
     <ClInclude Include="..\src\metric\xentropy_metric.hpp">
       <Filter>src\metric</Filter>
     </ClInclude>
+    <ClInclude Include="..\include\LightGBM\utils\file_io.h">
+      <Filter>include\LightGBM\utils</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\src\application\application.cpp">
@@ -287,5 +290,8 @@
     <ClCompile Include="..\src\boosting\gbdt_model_text.cpp">
       <Filter>src\boosting</Filter>
     </ClCompile>
+    <ClCompile Include="..\src\io\file_io.cpp">
+      <Filter>src\io</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>
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