diff --git a/vscode/react/src/pages/lineage.tsx b/vscode/react/src/pages/lineage.tsx
index cca63e5f9a..97da386e8b 100644
--- a/vscode/react/src/pages/lineage.tsx
+++ b/vscode/react/src/pages/lineage.tsx
@@ -15,6 +15,7 @@ import { useEventBus } from '@/hooks/eventBus'
 import type { VSCodeEvent } from '@bus/callbacks'
 import type { Model } from '@/api/client'
 import { useRpc } from '@/utils/rpc'
+import { isSameFilePath } from '@/utils/index'
 import {
   type ModelPath,
   type ModelFullPath,
@@ -98,12 +99,9 @@ function Lineage() {
       }
       // @ts-ignore
       const filePath: string = activeFile.fileUri
-      const model = models.find((m: Model) => {
-        if (!m.full_path) {
-          return false
-        }
-        return m.full_path === filePath
-      })
+      const model = models.find((m: Model) =>
+        isSameFilePath(m.full_path, filePath),
+      )
       if (model) {
         return model.name
       }
@@ -132,8 +130,8 @@ function Lineage() {
 
   React.useEffect(() => {
     const handleChangeFocusedFile = (fileUri: { fileUri: string }) => {
-      const model = Object.values(modelsRecord).find(
-        m => m.full_path === fileUri.fileUri,
+      const model = Object.values(modelsRecord).find(m =>
+        isSameFilePath(m.full_path, fileUri.fileUri),
       )
       if (model) {
         setSelectedModel(model.name)
diff --git a/vscode/react/src/utils/index.spec.ts b/vscode/react/src/utils/index.spec.ts
index d1d815e48b..02b0ffd1b6 100644
--- a/vscode/react/src/utils/index.spec.ts
+++ b/vscode/react/src/utils/index.spec.ts
@@ -11,6 +11,7 @@ import {
   toDateFormat,
   isStringEmpty,
   ensureString,
+  isSameFilePath,
 } from './index'
 
 describe('isArrayNotEmpty', () => {
@@ -209,3 +210,31 @@ describe('ensureString', () => {
     expect(ensureString('')).toBe('')
   })
 })
+
+describe('isSameFilePath', () => {
+  test('matches identical paths', () => {
+    expect(isSameFilePath('/a/models/m.sql', '/a/models/m.sql')).toBe(true)
+  })
+
+  test('ignores drive letter casing and separator differences', () => {
+    expect(
+      isSameFilePath(
+        'C:\\proj\\models\\core\\dim_product.sql',
+        'c:\\proj\\models\\core\\dim_product.sql',
+      ),
+    ).toBe(true)
+    expect(
+      isSameFilePath('C:\\proj\\models\\m.sql', 'c:/proj/models/m.sql'),
+    ).toBe(true)
+  })
+
+  test('returns false for different paths', () => {
+    expect(isSameFilePath('/a/models/a.sql', '/a/models/b.sql')).toBe(false)
+  })
+
+  test('returns false when either path is missing', () => {
+    expect(isSameFilePath(undefined, '/a.sql')).toBe(false)
+    expect(isSameFilePath('/a.sql', undefined)).toBe(false)
+    expect(isSameFilePath('', '')).toBe(false)
+  })
+})
diff --git a/vscode/react/src/utils/index.ts b/vscode/react/src/utils/index.ts
index ed0faab1db..65093b0fcf 100644
--- a/vscode/react/src/utils/index.ts
+++ b/vscode/react/src/utils/index.ts
@@ -209,3 +209,19 @@ export function truncate(
     text.substring(textLength - displayAfter)
   )
 }
+
+/**
+ * Compares two file system paths, ignoring path separator and casing
+ * differences (e.g. `C:\a\b.sql` vs `c:/a/b.sql` on Windows). Casing is
+ * ignored on every platform, which is fine for paths within a single project.
+ */
+export function isSameFilePath(
+  a: string | undefined | null,
+  b: string | undefined | null,
+): boolean {
+  if (!a || !b) {
+    return false
+  }
+  const normalize = (path: string) => path.replace(/\\/g, '/').toLowerCase()
+  return normalize(a) === normalize(b)
+}