diff --git a/packages/dnb-eufemia/src/components/upload/UploadFileListCell.tsx b/packages/dnb-eufemia/src/components/upload/UploadFileListCell.tsx
index 5c6f00caf4b..fb88a1d65ac 100644
--- a/packages/dnb-eufemia/src/components/upload/UploadFileListCell.tsx
+++ b/packages/dnb-eufemia/src/components/upload/UploadFileListCell.tsx
@@ -66,7 +66,7 @@ const UploadFileListCell = ({
   const { file, errorMessage, isLoading } = uploadFile
   const { name, type } = file
 
-  const fileType = type.split('/')[1]
+  const fileType = type.split('/')[1] || ''
 
   const hasWarning = errorMessage != null
 
diff --git a/packages/dnb-eufemia/src/components/upload/__tests__/UploadFileListCell.test.tsx b/packages/dnb-eufemia/src/components/upload/__tests__/UploadFileListCell.test.tsx
index 8a6c43c3dc5..0e68e9273aa 100644
--- a/packages/dnb-eufemia/src/components/upload/__tests__/UploadFileListCell.test.tsx
+++ b/packages/dnb-eufemia/src/components/upload/__tests__/UploadFileListCell.test.tsx
@@ -40,6 +40,19 @@ describe('UploadFileListCell', () => {
     expect(element.className).toMatch('dnb-upload__file-cell--warning')
   })
 
+  it('supports special file extensions', async () => {
+    render(
+      <UploadFileListCell
+        {...defaultProps}
+        uploadFile={{ file: createMockFile('file.dat', 100, 'dat') }}
+      />
+    )
+
+    const element = document.querySelector('.dnb-upload__file-cell__title')
+
+    expect(element.textContent).toMatch('file.dat')
+  })
+
   it('renders the no error styling', () => {
     render(
       <UploadFileListCell