how to open dat files

Hi, I had a problem with my PC and I want to restore my emails and contacts from my last backup. Can you please help me how to read the contents of the files inside the backup envelop ?

Hi Petros,
since the eM Client backup saves all the settings and other things as well, I think it might be best to restore from it using eM Client and going to File > Restore (please mind that this will overwrite all your current database).