Sonic Heroes is strictly a PS2 application wrapped in a PS3 container. Consequently, it does not support native PS3 features such as Trophies, Remote Play (natively), or advanced shading languages (HLSL).
The "PS3 PKG" of Sonic Heroes is essentially a wrapped PS2 ISO designed to run through the PS3’s internal software emulator. Sonic Heroes Ps3 Pkg
By the time he reached "Casino Park," things began to shift. The "PKG" wasn't just a game; it was a time capsule. Scattered throughout the levels were "Data Logs"—small, glowing discs that weren't in the original game. Sonic Heroes is strictly a PS2 application wrapped
If you own a PlayStation 3, you know the format. A .pkg file is the standard installation package for PS3 software—from official firmware updates to digital store downloads. So why does a game that never officially launched on the PS3 have a PKG floating around the web? By the time he reached "Casino Park," things began to shift
Can I find the PS2 version of Sonic Heroes on PS3? - Facebook