Hi Will. I'm Greg, an installation specialist, 10 years awarded Windows MVP, and Volunteer Moderator, here to help you.
You can see the actual C: drive folder under This PCC in Explorer, correct?
If the mystery file size is 0 bytes then there is nothing to worry about deleting the file because it is empty.. You can set a System Restore point first so you can go back if necessary: https://www.windowscentral.com/how-use-system-r...
If you ever want to be sure you're not infected download, install and run a full scan with the best on-demand scanner, free Malwarebyes from https://www.malwarebytes.com/mwb-download/. You can turn off the free trial in it's Account Settings if you want to keep it, which I would do because nothing else comes close to its thoroughness. But you don't need the Real Time protection if you don't get routinely infected.
I hope this helps. Based on the results you report back I may have other suggestions if necessary. If you will wait to choose whether the problem is resolved, then I will continue to help until the problem is fixed.
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Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.