O folders on the PC Encrypted?

About 10 years ago, I encrypted this folder on my laptop, unfortunately I do not know the name of the app any more and I do not find it anywhere

, You can see that I still have 5GB of data in it. But I can't answer.

Folder is only shown as a small piece of paper (see above).

Can help me jmdn

^ _ ^ Thank you

Without knowledge of the encryption and suitable password you will never get back to the data.

There are certainly ways to get there, but they must have knowledge in programming

Making the data visible again I'm not such a professional, but to back up important data on an external hard drive, that's what I've made the principle.