Jlinkx64sys -

C:\Windows\System32\drivers\jlinkx64.sys

When you install a typical J-Link software and documentation pack (v7.90+), the jlinkx64sys infrastructure includes: jlinkx64sys

The is where the "jlinkx64sys" keyword gains technical weight. On Windows systems, the SEGGER J-Link driver installs as jlinkx64.sys in C:\Windows\System32\drivers\ . This kernel-mode driver handles USB bulk transfers and hardware interrupts, ensuring low-latency communication. C:\Windows\System32\drivers\jlinkx64