Follow the steps bellow:
1- Go to System Admin>User Management>users/groups.
2-Add a new group and name it "Lookup_Group" and put a brief description.
3-In 'Group Type' select 'System Admin'
4-Expand the 'System Admin Rights' option.
5-Click on "Clear All" and only select the box "View Audit Logs" make sure is the only permission selected.
5-Save and Close.
6-Add a new user and name it 'lookup_user' and assing it to the following groups:
System Admin: Lookup_Group
Logger Rights: Default Logger Rights Group
Logger Report: Default Logger Report Group
Logger Search: Default Logger Search Group
7- Save and Close.
8-Log in with the lookup_user user and go to Configuration>select 'Lookup Files'.
9-Add the Lookup file.
Now the user is able to add Lookup files.