2022_12_09_c.7z

It may also be associated with "feature" sets for ROM collections or emulator front-ends (like RetroArch or LaunchBox) released on that specific date.

Often denotes a specific "C-series" update, which in many software lifecycles (like Windows or automotive firmware) represents a preview or optional feature update released toward the end of the month. 2022_12_09_C.7z

To provide more specific details about the features inside, could you clarify or what device/software it is intended for? It may also be associated with "feature" sets

This specific naming style is frequently used in community-shared firmware updates for vehicle infotainment systems (such as Mazda or Ford SYNC) or aftermarket head units. 2022_12_09_C.7z