If the Navicat backup used the same process as mysqldump, then your table's data is stored in a plain-text SQL script.
Step 1) find the CREATE TABLE... command for the table you are interested in.
Step 2) Just after the table's definition, you should see a sequence of INSERT commands. Those are your rows. Use your find or grep or search skills to identify the primary key values for the rows you are interested in. Visually parse that row (it's contained in its own set of () parentheses) to find the 'old' values you seek.
Sorry that it's such a manual process but you didn't want to restore so you get to pretend to be the database server :)