diff --git a/EduNetworkBuilder/EduNetworkBuilder.csproj b/EduNetworkBuilder/EduNetworkBuilder.csproj
index f018215..3f063e2 100644
--- a/EduNetworkBuilder/EduNetworkBuilder.csproj
+++ b/EduNetworkBuilder/EduNetworkBuilder.csproj
@@ -385,6 +385,12 @@
     <None Include="Resources\ip_phone.png" />
   </ItemGroup>
   <ItemGroup>
+    <FileAssociation Include=".enbh">
+      <Visible>False</Visible>
+      <Description>EduNetworkBuilder Homework files</Description>
+      <Progid>EduNetworkBuilder</Progid>
+      <DefaultIcon>Resources\NBIco.ico</DefaultIcon>
+    </FileAssociation>
     <FileAssociation Include=".enbu">
       <Visible>False</Visible>
       <Description>EduNetworkBuilder user file</Description>