I didn't omit to unchecking a box to allow this software to be installed. There were no check boxes. If its nothing to do with avast letting other programs write to the avast folder.... how did this file get in there? Is it an avast file?
You possibly had the safezone browser and that may have used it as it indicates as a test page. That said I have never installed (or had it magically appear), but I still have the file present.
It doesn't really bother me, but if you want to remove it, like other avast protected files you have to disable the avast self-defence module in the avastUI > Settings > Troubleshooting.