How to Convert Unreadable format of Content into Readable string format ?

Hello Experts,

I have Base64 Content and i need to change it in original format using ABAP. Here i am attaching one pic for that content.

How to change this content into Readable format...

I am new to this concept so that i am not confirm whether this is Base64 Format or not .

So ultimately i need to change the above format in any of our understandable format using ABAP Coding.

Thanks,

Vamsi.