There is no clear answer on the internet, so I thought I ask here. Is this file part of windows ? Thanks.
Culauncher was included in an update to Windows 10. It is a reliability improvement to Windows Update.
Reliability improvement to Windows 10 update components
These latest components make sure that the latest Cumulative Update is installed seamlessly to improve the reliability and security of Windows 10.
I would guess that "cu" stands for cumulative update.
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