It's possible that this version of Angry Birds was patched to run on devices that wouldn't normally support it, perhaps due to hardware limitations or because the official version wasn't available for those devices.
The "patched" versions of these VXP files are community-modified to fix common issues found in original feature phone ports, such as: vxp angry birds patched
The Complete Guide to VXP Angry Birds Patched: Reliving the Classic on Feature Phones It's possible that this version of Angry Birds
: Some versions are "cracked" to remove SMS-based payment prompts that no longer work. How to Install a .VXP Game If you have found a patched file, follow these steps to get it running: Check Compatibility Related Resources
: The resulting file is moved to an SD card and executed via the phone's built-in file manager. Related Resources