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#11
Well in that case you need to boot from something else to delete the file. A Linux Live USB is the usual suggestion, but you could also boot from a recovery drive USB and use the Command Prompt.
Create Recovery Drive in Windows 10
(untick 'include system files', you won't need them)
On the rare occasions when Windows won't let you delete a file booting from another OS (any other OS) is the quickest workaround. The recovery drive (or Linux) won't know (or care) about the file permissions.