I am using the EnterpriseDB pgAdmin III (v. 1.12.1) on a Windows 7, 32-bit machine to work with PostgreSQL databases on a remote Linux server. I am logged in as the user pos
I think your postgres user still don't have access to your file.
Did you tried the folowing commands ?
chown postgres /var/lib/pgsql/data/file.csv
chmod u+r /var/lib/pgsql/data/file.csv