If you open "Run" and type in just an f , you'll see paths, apps and files you've clicked before, on your hard disk.
This history cannot be deleted by common way (Folder options/General->Clear File Explorer history).
You have to go to IExplorer and delete its History, even if you don't use it at all!!!
What is responsible for this? Auto complete option on IE.
You have to go to Internet options->Content tab/AutoComplete Settings and
under Use AutoComplete for, uncheck Address bar. This will prevent IE spying user's activity.
Why IExplorer "AutoComplete" option affects "Run" history???