Hallo,
regarding this wiki article. I don't think its more secure to have a separate user than the actual 'local service' or 'network service' pseudo users to start up the service. Even if you assign 'guest' group to the self-made user its still an 'authenticated user' (NTFS, NT6+) that can access nearly all data on HDDs (read and write!).
A proper and limited environment would be something like the 'guest' account but FZS doesn't start with it (registry access limitation).
Any idea how to hardening the server properly in windows7 so FZS just has access to selected folders?
Securing Windows Service installation
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