diff --git a/core/services/download_service.py b/core/services/download_service.py
index 5c03f29..c9ff1bb 100644
--- a/core/services/download_service.py
+++ b/core/services/download_service.py
@@ -28,6 +28,7 @@ class DownloadService:
             "get_default_root_for_category"
         )
         self.get_download_directory = context.require("get_download_directory")
+        self.get_filename_from_path = context.require("get_filename_from_path")
         self.get_override_settings_from_request = context.require(
             "get_override_settings_from_request"
         )
@@ -103,7 +104,7 @@ class DownloadService:
         download_host = urlparse(url).hostname
 
         if not filename:
-            filename = unquote(urlparse(url).path.split("/")[-1])
+            filename = self.get_filename_from_path(unquote(urlparse(url).path))
         filename = self.sanitize_download_filename(filename)
 
         if not filename:
diff --git a/tests/test_download_routes.py b/tests/test_download_routes.py
index 443b19f..410ccf2 100644
--- a/tests/test_download_routes.py
+++ b/tests/test_download_routes.py
@@ -6,6 +6,7 @@ from unittest.mock import AsyncMock, MagicMock
 import pytest
 from aiohttp import web
 
+from core.path_utils import get_filename_from_path
 from core.routes.context import RouteContext
 from core.routes.downloads import register_download_routes
 from core.type_utils import to_bool, to_int
@@ -68,6 +69,7 @@ def _build_download_routes(overrides=None):
         ),
         "get_default_root_for_category": MagicMock(return_value=r"C:\base"),
         "get_download_directory": MagicMock(return_value=r"C:\models"),
+        "get_filename_from_path": get_filename_from_path,
         "get_override_settings_from_request": AsyncMock(
             return_value={"aria2c_path": "aria2c"}
         ),
@@ -228,6 +230,27 @@ async def test_download_route_supports_huggingface_headers_and_optional_inputs()
     values["get_default_root_for_category"].assert_not_called()
 
 
+@pytest.mark.asyncio
+async def test_download_route_derives_encoded_filename_from_url_path():
+    handlers, values = _build_download_routes()
+    handler = handlers[("POST", "/model_resolver/download")]
+
+    response = await handler(
+        _request(
+            {
+                "url": "https://example.com/download/model%20name.safetensors",
+            }
+        )
+    )
+
+    body = json.loads(response.text)
+    assert response.status == 200
+    assert body["filename"] == "model name.safetensors"
+    assert values["start_background_download"].call_args.kwargs["filename"] == (
+        "model name.safetensors"
+    )
+
+
 @pytest.mark.asyncio
 async def test_download_route_handles_existing_civitai_token_and_path_errors():
     handlers, values = _build_download_routes()
diff --git a/tests/test_downloads_tab_workflow_route.mjs b/tests/test_downloads_tab_workflow_route.mjs
index 97c1650..07ac76c 100644
--- a/tests/test_downloads_tab_workflow_route.mjs
+++ b/tests/test_downloads_tab_workflow_route.mjs
@@ -5236,6 +5236,9 @@ test('downloads tab renders workflow label for active downloads', () => {
     getDownloadFolderContext() {
       return null;
     },
+    getFilenameFromPath(value = '') {
+      return String(value).split(/[\\/]/).at(-1) || '';
+    },
     getDownloadDisplayProgress(progress) {
       return {
         percent: progress.progress || 0,
@@ -5266,6 +5269,68 @@ test('downloads tab renders workflow label for active downloads', () => {
 
   assert.match(html, /<span>Workflow<\/span>/);
   assert.match(html, /Workflow B/);
+
+  const fallbackHtml = renderQueueDownloadsHtml.call(dialog, [{
+    downloadId: 'download-2',
+    info: {
+      missing: {
+        original_path: 'models\\fallback.safetensors',
+        node_id: 9,
+        widget_index: 1,
+        node_type: 'CheckpointLoaderSimple',
+        category: 'checkpoints',
+      },
+      lastProgress: { status: 'downloading', progress: 10 },
+    },
+  }]);
+
+  assert.match(fallbackHtml, /fallback\.safetensors/);
+});
+
+test('download queue context derives fallback names from Windows paths', () => {
+  const getDownloadQueueContext = eval(`(${extractMethod(queueMethodsSource, 'getDownloadQueueContext')})`);
+  const dialog = {
+    getDownloadFolderContext() {
+      return null;
+    },
+    getFilenameFromPath(value = '') {
+      return String(value).split(/[\\/]/).at(-1) || '';
+    },
+    getDownloadWorkflowLabel() {
+      return '';
+    },
+    getWorkflowContextId() {
+      return 'workflow-1';
+    },
+    getWorkflowContextRouteKey() {
+      return 'workflow-route-1';
+    },
+    canSwitchToDownloadWorkflow() {
+      return true;
+    },
+  };
+
+  const context = getDownloadQueueContext.call(dialog, {}, {
+    missing: { original_path: 'models\\fallback.safetensors' },
+  }, '', 'download-1');
+
+  assert.equal(context.name, 'fallback.safetensors');
+});
+
+test('context menu model data derives fallback names from Windows paths', () => {
+  const buildContextMenuModelData = eval(`(${extractMethod(searchPanelMethodsSource, 'buildContextMenuModelData')})`);
+  const dialog = {
+    getFilenameFromPath(value = '') {
+      return String(value).split(/[\\/]/).at(-1) || '';
+    },
+  };
+
+  const model = buildContextMenuModelData.call(dialog, {}, '', {
+    resolved_path: 'models\\fallback.safetensors',
+  });
+
+  assert.equal(model.name, 'fallback.safetensors');
+  assert.equal(model.original_path, 'fallback.safetensors');
 });
 
 test('active download refresh preserves existing cards for hover and tooltip state', () => {
diff --git a/tests/test_queue_storage_methods.mjs b/tests/test_queue_storage_methods.mjs
index 619c931..a5b18c6 100644
--- a/tests/test_queue_storage_methods.mjs
+++ b/tests/test_queue_storage_methods.mjs
@@ -239,15 +239,18 @@ test('queue storage remembers completed downloads using progress and missing-mod
       ...queueStorageMethods,
       downloadHistoryStorageKey: 'completed-history',
       updateQueuePanel() {},
+      getFilenameFromPath(value = '') {
+        return String(value).split(/[\\/]/).at(-1) || '';
+      },
       getDownloadWorkflowLabel: () => 'Workflow A',
       getCategoryDisplayName: category => category.toUpperCase(),
     };
 
     const entry = context.rememberCompletedDownloadHistory(
       'download-1',
-      {
-        missing: {
-          original_path: 'loras/fallback.safetensors',
+        {
+          missing: {
+          original_path: 'loras\\fallback.safetensors',
           category: 'loras',
           node_id: 7,
           widget_index: 2,
diff --git a/web/resolver/actions/queue_methods.js b/web/resolver/actions/queue_methods.js
index 8ad38fc..91b929d 100644
--- a/web/resolver/actions/queue_methods.js
+++ b/web/resolver/actions/queue_methods.js
@@ -857,7 +857,7 @@ export const queueMethods = {
             context_scope: 'download_queue',
             download_id: downloadId,
             open_folder_label: folderContext ? 'Open Download Folder' : '',
-            name: folderContext?.name || progress?.filename || info?.filename || missing?.original_path?.split(/[/\\]/).pop() || 'Download',
+            name: folderContext?.name || progress?.filename || info?.filename || this.getFilenameFromPath(missing?.original_path) || 'Download',
             workflow_id: info.workflowId || info.workflow_id || this.getWorkflowContextId(info) || '',
             workflow_label: label,
             workflow_route_key: info.workflowRouteKey || this.getWorkflowContextRouteKey(info) || '',
@@ -1202,7 +1202,7 @@ export const queueMethods = {
             const filename = progress.filename
                 || info.filename
                 || info.missing?.download_source?.filename
-                || info.missing?.original_path?.split(/[/\\]/).pop()
+                || this.getFilenameFromPath(info.missing?.original_path)
                 || 'model';
             const category = this.getCategoryDisplayName?.(info.category || info.missing?.category || '') || info.category || '';
             const nodeLabel = info.missing?.subgraph_name || info.missing?.node_type || (info.missing?.subgraph_id ? 'Subgraph' : 'Node');
diff --git a/web/resolver/actions/queue_storage_methods.js b/web/resolver/actions/queue_storage_methods.js
index d875522..af80369 100644
--- a/web/resolver/actions/queue_storage_methods.js
+++ b/web/resolver/actions/queue_storage_methods.js
@@ -190,7 +190,7 @@ export const queueStorageMethods = {
         const filename = progress.filename
             || info.filename
             || missing.download_source?.filename
-            || missing.original_path?.split(/[/\\]/).pop()
+            || this.getFilenameFromPath(missing.original_path)
             || '';
         if (!filename) return null;
 
diff --git a/web/resolver/search/search_panel.js b/web/resolver/search/search_panel.js
index ee45e0a..024577d 100644
--- a/web/resolver/search/search_panel.js
+++ b/web/resolver/search/search_panel.js
@@ -2104,7 +2104,7 @@ export const searchPanelMethods = {
             ...(extra && typeof extra === 'object' ? extra : {})
         };
         const resolvedPath = merged.path || merged.resolved_path || '';
-        const filename = merged.filename || fallbackName || resolvedPath.split(/[/\\]/).pop() || '';
+        const filename = merged.filename || fallbackName || this.getFilenameFromPath(resolvedPath) || '';
         return {
             ...merged,
             name: merged.name || filename,