Yes, Authorization was set to "NTFS authorization (Windows controls file access)" in the server, and it was not the problem.
Section access is enabled, and the problem was related to it.
The user was not included in the configuration file that loads into the section access.
I have just included this user in this file and reloaded the document, and now the document is visible for the user !!!
I believed that the visibility of files in AccessPoint was only managed by NT permissions, and I was wrong.
Thank you very much !!!