Google Webmaster console: text file from 2000 not found

It was a database file of my local search engine

[jetteroheller]

In the year 2000, I learned that Google ignores meta tag keywords.

This discovery was based on the database files of my local search engine.

I had a folder admin and there had been the index files for my local search engine like

a.txt
b.txt
c.txt
....
z.txt

Looking on my referer logs, I wondered why Google sent people to t.txt

I wondered also how google indexed the admin folder at all.

I learned by this also, that it's a good idea to move the admin folder to a different location outside the http access area.

Now I read in the Google sitemaps, that this admin/a.txt gives an error 404. More than 6 years not at this location.