For collectors and digital preservationists, VXP Angry Birds is considered a "lost" version because Rovio discontinued BREW support by 2012. Unlike the Java ME (JAR/JAD) versions, which are relatively easy to emulate, VXP files are notoriously difficult to run due to licensing checks and the obsolescence of the BREW platform.
To understand the significance of Angry Birds VXP, one must first understand the hardware it ran on.
During the "dumbphone" era, just before Android and iOS swallowed the market, Chinese chip manufacturers like MediaTek (MTK) and Spreadtrum dominated the global market for budget feature phones. These phones (often branded locally as Micromax, Spice, Symphony, or generic knock-offs) did not run Java ME (J2ME), which was the standard for Nokia and Sony Ericsson.
Instead, they ran a proprietary operating system known as MRE (Mobile Runtime Environment).
Applications designed for MRE were compiled into files with the .vxp extension. These were lightweight, native-code applications designed to run on devices with incredibly limited resources—often as little as 200KB of RAM and screens as small as 128x160 pixels.
Because the BREW ecosystem was locked down by carriers, legitimate VXP files are hard to find. However, they exist in the depths of abandonware forums and Russian file repositories (such as 4pda or w10elem).