Tables data base

I would like to know what there is in the tables:
mail_fti.dat
mail_data.dat
mail_index.dat
telemetry.dat

Mail files contain your messages and the telemetry.dat is a table needed for your feedback. Maybe you noticed that eM Client asks you if you want help us enhance our product.

Thanks. I just wanted to know the difference for example between mail_fti and mail_index. I’d like to retrieve some mails from corrupted database.