Strange Microsoft Office files in Temp Folder

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Noticed 3 strange files in my Temp folder from yesterday that I have never seen before:

prep_crosoft Office_root_Office16_sdxs_FA000000062_index_win32_bundle_V8_perf.cache

prep_foundation_win32_bundle_V8_perf.cache

prep_ui_wind32_bundle_V8_perf.cache

Nothing  note worthy shows up in Google and Total Virus flags them as “Undetected” across all Vendors.

Any ideas or concerns?

Windows 10 Pro x64 v22H2 and Windows 7 Pro SP1 x64 (RIP)

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There are Temp folders in multiple locations in Windows.
What is the location of the Temp folder?

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C:\users\username\AppData\Local\Temp

Even though I have the retail C2R version of Microsoft Office 2016, I now note in Word that the Home tab includes a side screen called “Microsoft Editor” which I can manually close but reappears with each opening of the Word program.

Ok now really strange, just reopened Word to get more details and it is currently gone!

Perhaps MS messed up and added to C2R (which are not suppose to receive new feature updates) by mistake?

Will keep advised, but possible reason for the Temp files I originally refer to?

Windows 10 Pro x64 v22H2 and Windows 7 Pro SP1 x64 (RIP)

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