If you installed the Sega Classics collection to a custom library location, check there instead.
Many specific file searches in the Sonic community point toward modern fan reconstructions rather than basic emulation. Sonic 3 A.I.R. (Angel Island Revisited) Sonic Knuckles Wsonic3.bin File Download -HOT
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Here are a few tips and tricks to help you get the most out of playing Sonic & Knuckles with Wsonic3.bin: If you installed the Sega Classics collection to
: The best way to get these files is through the Sonic Origins collection or the older Sega Mega Drive and Genesis Classics on Steam. Once purchased, you can often find the .bin or .68k files in the Steam installation folder. Sonic Knuckles Wsonic3.bin File Download -HOT