Files with the .sys extension are Windows System Files. The .sys file extension was developed by the Microsoft Corporation. Files with the .sys file extension are used by the Microsoft DOS and Windows operating systems to store data about the device drivers, settings and other Windows system information on a computer.
Common SYS files include MSDOS.sys and IO.sys. Most files containing the .sys file extension are hidden by the computer's operating system.
Even though SYS files are primarily Windows files, they can be used on Mac systems that have Windows installed on them. However, a Mac computer that does not have Windows installed will not be able to run a SYS file.
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