diff --git a/folder_paths.py b/folder_paths.py
index 72c70f594..9a525e5a1 100644
--- a/folder_paths.py
+++ b/folder_paths.py
@@ -85,6 +85,7 @@ cache_helper = CacheHelper()
 
 extension_mimetypes_cache = {
     "webp" : "image",
+    "fbx" : "model",
 }
 
 def map_legacy(folder_name: str) -> str:
@@ -140,11 +141,14 @@ def get_directory_by_type(type_name: str) -> str | None:
         return get_input_directory()
     return None
 
-def filter_files_content_types(files: list[str], content_types: Literal["image", "video", "audio"]) -> list[str]:
+def filter_files_content_types(files: list[str], content_types: Literal["image", "video", "audio", "model"]) -> list[str]:
     """
     Example:
         files = os.listdir(folder_paths.get_input_directory())
-        filter_files_content_types(files, ["image", "audio", "video"])
+        videos = filter_files_content_types(files, ["video"])
+
+    Note:
+        - 'model' in MIME context refers to 3D models, not files containing trained weights and parameters
     """
     global extension_mimetypes_cache
     result = []
diff --git a/tests-unit/folder_paths_test/filter_by_content_types_test.py b/tests-unit/folder_paths_test/filter_by_content_types_test.py
index 423677a60..5fb1b0e7b 100644
--- a/tests-unit/folder_paths_test/filter_by_content_types_test.py
+++ b/tests-unit/folder_paths_test/filter_by_content_types_test.py
@@ -1,14 +1,17 @@
 import pytest
 import os
 import tempfile
-from folder_paths import filter_files_content_types
+from folder_paths import filter_files_content_types, extension_mimetypes_cache
+from unittest.mock import patch
+
 
 @pytest.fixture(scope="module")
 def file_extensions():
     return {
         'image': ['gif', 'heif', 'ico', 'jpeg', 'jpg', 'png', 'pnm', 'ppm', 'svg', 'tiff', 'webp', 'xbm', 'xpm'],
         'audio': ['aif', 'aifc', 'aiff', 'au', 'flac', 'm4a', 'mp2', 'mp3', 'ogg', 'snd', 'wav'],
-        'video': ['avi', 'm2v', 'm4v', 'mkv', 'mov', 'mp4', 'mpeg', 'mpg', 'ogv', 'qt', 'webm', 'wmv']
+        'video': ['avi', 'm2v', 'm4v', 'mkv', 'mov', 'mp4', 'mpeg', 'mpg', 'ogv', 'qt', 'webm', 'wmv'],
+        'model': ['gltf', 'glb', 'obj', 'mtl', 'fbx', 'stl']
     }
 
 
@@ -22,7 +25,18 @@ def mock_dir(file_extensions):
         yield directory
 
 
-def test_categorizes_all_correctly(mock_dir, file_extensions):
+@pytest.fixture
+def patched_mimetype_cache(file_extensions):
+    # Mock model file extensions since they may not be in the test-runner system's mimetype cache
+    new_cache = extension_mimetypes_cache.copy()
+    for extension in file_extensions["model"]:
+        new_cache[extension] = "model"
+
+    with patch("folder_paths.extension_mimetypes_cache", new_cache):
+        yield
+
+
+def test_categorizes_all_correctly(mock_dir, file_extensions, patched_mimetype_cache):
     files = os.listdir(mock_dir)
     for content_type, extensions in file_extensions.items():
         filtered_files = filter_files_content_types(files, [content_type])
@@ -30,7 +44,7 @@ def test_categorizes_all_correctly(mock_dir, file_extensions):
             assert f"sample_{content_type}.{extension}" in filtered_files
 
 
-def test_categorizes_all_uniquely(mock_dir, file_extensions):
+def test_categorizes_all_uniquely(mock_dir, file_extensions, patched_mimetype_cache):
     files = os.listdir(mock_dir)
     for content_type, extensions in file_extensions.items():
         filtered_files = filter_files_content_types(files, [content_type])