2022_12_09_c.7z

A high-compression archive format requiring software like 7-Zip or WinRAR to open. Potential Origins

Used for logging specific feature patches for embedded controllers or PLC systems. 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. 2022_12_09_C.7z

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