A Challenging Problem Regarding Video Format

Hello

I have a Mac app that encrypt files and i have encrypted a lot of videos, but something went wrong and the app was deleted and all the videos couldn't be unencrypted or found.

But when i get the info of the folder that i put them in, i found that the folder size was not change and the videos are still there but encrypted and hidden. So, i have unhide them using the terminal app in my mac.

Fortunately, all the videos have came back with its original sizes, but they are not in video format, and when i click on info, the video media format is written as (package) and do not play, and when i open the package i found all the small files in the package as bands in TextEdit Document format.

My question is: how can i get my videos back please?

Thanks