Summary
An error occurs in Sage 50 during data conversion: "Cannot open company file".
Cause
Network Interface Card default IP protocol is set to IPV6. Sage 50 uses IPV4 protocol for database.
Resolution
CAUTION: This solution requires an advanced understanding of Windows or third-party add-ons. Mistakes in the Windows registry, security, and network settings can cause serious problems. Sage isn't responsible for the Windows environment, third-party add-ons, or customization issues. Create a system and database backup before making changes. Get help from your system admin, consultant, or vendor.
Set Windows OS to prefer IPv4 addresses over IPv6. See How to set Windows 10 to prefer IPv4 over IPv6
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