Be cautious when downloading .docx files from unofficial "free download" sites. VAT identification numbers - Taxation and Customs Union
Unlike PDFs, .docx files allow you to easily fill in company details or tax codes.
Depending on your specific need, this search usually points to one of three things:
The unique code assigned to businesses for tax purposes. In the EU, this is often checked via the VIES system to confirm a company's legitimacy.