Before the domination of Android, many feature phones ran on operating systems like Nokia Series 30+ (S30+) or the MediaTek MRE platform. These systems do not run .apk (Android) or .jar (Java) files. Instead, they use the VXP format.
A VXP file is an executable application package specifically designed for the MediaTek Runtime Environment (MRE). Getting Angry Birds to run on these devices isn't as simple as downloading an app from a store; it requires finding a port of the game specifically compiled for this lightweight architecture. vxp angry birds 320x480 work
Warning: This process violates the game’s original license for personal use only. Do not redistribute converted files. Before the domination of Android, many feature phones
Many VXP phones have a "Signature Check". To bypass: Before the domination of Android