autoindex on - 404 not found

Hi all,

I installed nginx on an offline computer, I configured it
and it worked fine. But when I installed nginx as a service
with NSSM, autoindex does not work, I get an 404 error
message, I can't access any html page but the php pages
are working fine.

When I run nginx normally in the command prompt, not
as a service, everything works fine again, but when I run
nginx as a service, I get an 404 error message.

Can anyone please help me with this issue?

Thanks in advance.