"Getting Started with invoice.abcsys
This has all the hallmarks of a cyberattack. Stay safe and delete it. invoice.abcsys
The only exception is if you work for a company that uses an internal network domain ending in .abcsys . If this is the case, verify the sender through a separate channel (like a phone call or internal chat) before opening the file. "Getting Started with invoice
To avoid future issues, request invoices in or XML (Factur-X/ZUGFeRD) – both are widely accepted and legally compliant in many countries. invoice.abcsys