Open or export?

Recently I got note from some beta testers, that imported old .azz file cards are mixed with existing cards (e. g. samples).

It is intended to transfer old version program files by opening them, not importing.

There is a difference between file opening and importing – import will add cards to existing file – it is useful to merge files together or synchronize them (e. g. from Android after editing there).

Such behavior was in previous version, however I feel, that I need to add .azz and .azzx to default extensions in Open dialog and explain Import feature in tool-tips and hints.