Meta-inf is a folder where include one file name MANIFEST.MF.

MANIFEST.MF
It is one of text file in format .MF there include most important details (name, vendor, version, description, icon, data size etc.) It is most important file for java game/app. If we want to change games/apps name we need to edit it.

How We Can Open/Edit MANIFEST.MF File?
By Text_Editor/Mini_Commander we can open/edit it.