The file dr super was talking about is the .wts string-file.
But the wc3mapOptimizer inlines this strings into the .j - so this won't help you.
You have to replace the strings inside the war3map.j
The ObjectEditor Data may be curropted or deleted by the optimizer, but I don't know for sure.
You could try to export it and import it into a blank map and then modify, export, import.