Most users searching for this specific string are looking for the raw data necessary to run the game on a modern device. However, because the file contains proprietary code from Sega, it is rarely hosted on official sites. Instead, it exists in a "grey area" of the internet, found on abandonware repositories or community forums dedicated to game preservation.
folder within your Sega Classics directory or directly into your Sonic 3 AIR installation folder. Mobile (Android/iOS): Use a file manager like to place the file in the game's data folder (usually Android/data/org.eukaryot.sonic3air Launch and Play: Sonic Knuckles Wsonic3.bin File Download - Google
Copy Sonic_Knuckles_wSonic3.bin and move it to your installation folder. What if I don't have the Steam version? Most users searching for this specific string are