diff --git a/CoDepend/.codepend/snapshot b/CoDepend/.codepend/snapshot
index aa638e3..d3b5fb4 100644
Binary files a/CoDepend/.codepend/snapshot and b/CoDepend/.codepend/snapshot differ
diff --git a/CoDepend/Domain/RendererBase.cs b/CoDepend/Domain/RendererBase.cs
index 43134f4..d5f3c9c 100644
--- a/CoDepend/Domain/RendererBase.cs
+++ b/CoDepend/Domain/RendererBase.cs
@@ -49,6 +49,9 @@ public abstract class RendererBase
 {
     public abstract string FileExtension { get; }
 
+    // Normalized file extension with proper dot handling
+    private string NormalizedFileExtension => NormalizeExtension(FileExtension);
+
     protected abstract string Render(RenderGraph graph, View view, RenderOptions options);
 
     public string RenderView(ProjectDependencyGraph graph, View view, RenderOptions options)
@@ -96,12 +99,18 @@ public async Task SaveViewToFileAsync(string content, View view, RenderOptions o
         Directory.CreateDirectory(dir);
 
         var diffString = diff ? "-diff" : "";
-        var filename = $"{options.BaseOptions.ProjectName}{diffString}-{view.ViewName}.{FileExtension}";
+        var filename = $"{options.BaseOptions.ProjectName}{diffString}-{view.ViewName}{NormalizedFileExtension}";
         var path = Path.Combine(dir, filename);
 
         await File.WriteAllTextAsync(path, content, ct);
     }
 
+    private static string NormalizeExtension(string ext)
+    {
+        ext = ext.Trim();
+        return ext.StartsWith('.') ? ext : "." + ext;
+    }
+
     private static RenderGraph BuildRenderGraph(
         ProjectDependencyGraph graph,
         View view,
@@ -450,4 +459,4 @@ private static bool IsUnderAnyRoot(RelativePath path, IReadOnlySet<RelativePath>
     {
         return roots.Any(root => path.Value.StartsWith(root.Value, StringComparison.OrdinalIgnoreCase));
     }
-}
+}
\ No newline at end of file