Stop retrying unsupported file types

service/Abstractions/Pipeline/MimeTypeException.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+
+namespace Microsoft.KernelMemory.Pipeline;
+
+public class MimeTypeException : KernelMemoryException
+{
+    /// <inheritdoc />
+    public MimeTypeException(bool? isTransient = null)
+    {
+        this.IsTransient = isTransient;
+    }
+
+    /// <inheritdoc />
+    public MimeTypeException(string message, bool? isTransient = null) : base(message)
+    {
+        this.IsTransient = isTransient;
+    }
+
+    /// <inheritdoc />
+    public MimeTypeException(string message, Exception? innerException, bool? isTransient = null) : base(message, innerException)
+    {
+        this.IsTransient = isTransient;
+    }
+}

service/Abstractions/Pipeline/MimeTypes.cs

@@ -221,7 +221,7 @@ public string GetFileType(string filename)
             return mimeType;
         }
 
-        throw new NotSupportedException($"File type not supported: {filename}");
+        throw new MimeTypeException($"File type not supported: {filename}", isTransient: false);
     }
 
     public bool TryGetFileType(string filename, out string? mimeType)

service/Core/Pipeline/BaseOrchestrator.cs

@@ -477,7 +477,7 @@ private async Task UploadFormFilesAsync(DataPipeline pipeline, CancellationToken
             {
                 mimeType = this._mimeTypeDetection.GetFileType(file.FileName);
             }
-            catch (NotSupportedException)
+            catch (MimeTypeException)
             {
                 this.Log.LogWarning("File type not supported, the ingestion pipeline might skip it");
             }