diff --git a/Comments/Add-comments-in-PowerPoint/.NET/Add-comments-in-PowerPoint/Add-comments-in-PowerPoint.csproj b/Comments/Add-comments-in-PowerPoint/.NET/Add-comments-in-PowerPoint/Add-comments-in-PowerPoint.csproj
index 37c560e..9e92428 100644
--- a/Comments/Add-comments-in-PowerPoint/.NET/Add-comments-in-PowerPoint/Add-comments-in-PowerPoint.csproj
+++ b/Comments/Add-comments-in-PowerPoint/.NET/Add-comments-in-PowerPoint/Add-comments-in-PowerPoint.csproj
@@ -13,7 +13,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <None Update="Output\gitkeep.txt">
+    <None Update="Output\.gitkeep">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
   </ItemGroup>
diff --git a/Comments/Add-comments-in-PowerPoint/.NET/Add-comments-in-PowerPoint/Output/gitkeep.txt b/Comments/Add-comments-in-PowerPoint/.NET/Add-comments-in-PowerPoint/Output/.gitkeep
similarity index 100%
rename from Comments/Add-comments-in-PowerPoint/.NET/Add-comments-in-PowerPoint/Output/gitkeep.txt
rename to Comments/Add-comments-in-PowerPoint/.NET/Add-comments-in-PowerPoint/Output/.gitkeep
diff --git a/Comments/Add-reply-comment-in-PowerPoint/.NET/Add-reply-comment-in-PowerPoint/Add-reply-comment-in-PowerPoint.csproj b/Comments/Add-reply-comment-in-PowerPoint/.NET/Add-reply-comment-in-PowerPoint/Add-reply-comment-in-PowerPoint.csproj
index 204955b..dd950c2 100644
--- a/Comments/Add-reply-comment-in-PowerPoint/.NET/Add-reply-comment-in-PowerPoint/Add-reply-comment-in-PowerPoint.csproj
+++ b/Comments/Add-reply-comment-in-PowerPoint/.NET/Add-reply-comment-in-PowerPoint/Add-reply-comment-in-PowerPoint.csproj
@@ -16,7 +16,7 @@
     <None Update="Data\Template.pptx">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
-    <None Update="Output\gitkeep.txt">
+    <None Update="Output\.gitkeep">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
   </ItemGroup>
diff --git a/Comments/Add-reply-comment-in-PowerPoint/.NET/Add-reply-comment-in-PowerPoint/Output/gitkeep.txt b/Comments/Add-reply-comment-in-PowerPoint/.NET/Add-reply-comment-in-PowerPoint/Output/.gitkeep
similarity index 100%
rename from Comments/Add-reply-comment-in-PowerPoint/.NET/Add-reply-comment-in-PowerPoint/Output/gitkeep.txt
rename to Comments/Add-reply-comment-in-PowerPoint/.NET/Add-reply-comment-in-PowerPoint/Output/.gitkeep
diff --git a/Comments/Delete-comment-by-position/.NET/Delete-comment-by-position/Delete-comment-by-position.csproj b/Comments/Delete-comment-by-position/.NET/Delete-comment-by-position/Delete-comment-by-position.csproj
index 2f02bb2..900deab 100644
--- a/Comments/Delete-comment-by-position/.NET/Delete-comment-by-position/Delete-comment-by-position.csproj
+++ b/Comments/Delete-comment-by-position/.NET/Delete-comment-by-position/Delete-comment-by-position.csproj
@@ -16,7 +16,7 @@
     <None Update="Data\Template.pptx">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
-    <None Update="Output\gitkeep.txt">
+    <None Update="Output\.gitkeep">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
   </ItemGroup>
diff --git a/Comments/Delete-comment-by-position/.NET/Delete-comment-by-position/Output/gitkeep.txt b/Comments/Delete-comment-by-position/.NET/Delete-comment-by-position/Output/.gitkeep
similarity index 100%
rename from Comments/Delete-comment-by-position/.NET/Delete-comment-by-position/Output/gitkeep.txt
rename to Comments/Delete-comment-by-position/.NET/Delete-comment-by-position/Output/.gitkeep
diff --git a/Comments/Delete-comment/.NET/Delete-comment/Delete-comment.csproj b/Comments/Delete-comment/.NET/Delete-comment/Delete-comment.csproj
index f387efe..9fa3bdc 100644
--- a/Comments/Delete-comment/.NET/Delete-comment/Delete-comment.csproj
+++ b/Comments/Delete-comment/.NET/Delete-comment/Delete-comment.csproj
@@ -16,7 +16,7 @@
     <None Update="Data\Template.pptx">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
-    <None Update="Output\gitkeep.txt">
+    <None Update="Output\.gitkeep">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
   </ItemGroup>
diff --git a/Comments/Delete-comment/.NET/Delete-comment/Output/gitkeep.txt b/Comments/Delete-comment/.NET/Delete-comment/Output/.gitkeep
similarity index 100%
rename from Comments/Delete-comment/.NET/Delete-comment/Output/gitkeep.txt
rename to Comments/Delete-comment/.NET/Delete-comment/Output/.gitkeep
diff --git a/Comments/Modify-comment-author/.NET/Modify-comment-author/Modify-comment-author.csproj b/Comments/Modify-comment-author/.NET/Modify-comment-author/Modify-comment-author.csproj
index 2a7d3f7..22c9181 100644
--- a/Comments/Modify-comment-author/.NET/Modify-comment-author/Modify-comment-author.csproj
+++ b/Comments/Modify-comment-author/.NET/Modify-comment-author/Modify-comment-author.csproj
@@ -16,7 +16,7 @@
     <None Update="Data\Template.pptx">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
-    <None Update="Output\gitkeep.txt">
+    <None Update="Output\.gitkeep">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
   </ItemGroup>
diff --git a/Comments/Modify-comment-author/.NET/Modify-comment-author/Output/gitkeep.txt b/Comments/Modify-comment-author/.NET/Modify-comment-author/Output/.gitkeep
similarity index 100%
rename from Comments/Modify-comment-author/.NET/Modify-comment-author/Output/gitkeep.txt
rename to Comments/Modify-comment-author/.NET/Modify-comment-author/Output/.gitkeep
diff --git a/Comments/Modify-comment-content/.NET/Modify-comment-content/Modify-comment-content.csproj b/Comments/Modify-comment-content/.NET/Modify-comment-content/Modify-comment-content.csproj
index a7602a3..fbcb7be 100644
--- a/Comments/Modify-comment-content/.NET/Modify-comment-content/Modify-comment-content.csproj
+++ b/Comments/Modify-comment-content/.NET/Modify-comment-content/Modify-comment-content.csproj
@@ -16,7 +16,7 @@
     <None Update="Data\Template.pptx">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
-    <None Update="Output\gitkeep.txt">
+    <None Update="Output\.gitkeep">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
   </ItemGroup>
diff --git a/Comments/Modify-comment-content/.NET/Modify-comment-content/Output/gitkeep.txt b/Comments/Modify-comment-content/.NET/Modify-comment-content/Output/.gitkeep
similarity index 100%
rename from Comments/Modify-comment-content/.NET/Modify-comment-content/Output/gitkeep.txt
rename to Comments/Modify-comment-content/.NET/Modify-comment-content/Output/.gitkeep