In the explorer, type:
shell:startup for the user's folder,shell:common startup for the folder common to all users.The programs put in this folders are launched when opening a Windows 10 session.
Despite the user has no launched an HTTP server, the port 80 is in use, as can be seen with netstat. This is due to a service called W3SVC (group iissvcs).
Don't know what the purpose of this service is (don't really search…). Deactivating it seems not to be a problem…
To retrieve only files with a given name, type system.filename:<file name> in the search text box from the file explorer (you might also retrieve files which name begin with the given pattern).
The hosts file will be found under Windows at C:\Windows\System32\drivers\etc\hosts. This file can be mklinked (mklink C:\Windows\System32\drivers\etc\hosts …).
For the modification in this file to be taken into account, it could be necessary to clear the DNS cache, by launching ipconfig /flushdns.
(From https://appuals.com/best-fix-how-to-fix-temporary-profile-issues-in-windows-10/.)
If Windows is unable to connect to your usual account and instead logged you in a temporary account, even after restarting the computer, remove the .bak extension from the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\(long number).bak registry entry, after renaming (or deleting) the same entry without the .bak extension, and restart the computer.
Launch netplwiz.
(From http://superuser.com/questions/29072/how-to-make-subst-mapping-persistent-across-reboots.)
In the registry, at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\DOS Devices, add a string value with, as name, the drive letter with the colon (:), and, as value, \??\ followed by the folder (example : \??\C:\Documents and Settings\All Users\Shared Documents). Reboot.
The assignation of a drive letter to with subst command does not survive to a boot.