Yes, several proprietary enterprise systems use internal naming conventions that never appear in public documentation.
To understand what this specific keyword means, it is helpful to look at the individual components of the string: ces x64frev
The label is most commonly associated with Windows 10 Enterprise . It is frequently found on original installation discs or ISO files downloaded from official Microsoft portals like the Microsoft Volume Licensing Service Center (VLSC) . Common Contexts ces x64frev