File format not allowed: file.docx

### Bug

Trying to use the docling `DocumentConverter` as in the [simple conversion](https://ds4sd.github.io/docling/examples/minimal/) example on a .docx file gives the error `docling.exceptions.ConversionError: File format not allowed: file.docx`, but from the docling documentation docx should be supported. The files were created in a sharepoint drive using the web interface. Expected behaviour is the script running without errors.

### Steps to reproduce

Here is some information about the file and then the repro script
```bash
➜ file file.docx
file.docx: Microsoft Word 2007+
```

```bash
➜ file --mime-type -b file.docx
application/vnd.openxmlformats-officedocument.wordprocessingml.document
```

```python
from docling.document_converter import DocumentConverter

source = "file.docx"
converter = DocumentConverter()
result = converter.convert(source)
print(result.document.export_to_markdown())
```

### Docling version

Docling version: 2.15.1
Docling Core version: 2.14.0
Docling IBM Models version: 3.1.2
Docling Parse version: 3.0.0

### Python version

Python 3.12.7