Retro SDK Archive
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What is an RSDK file?
An RSDK file is an archive used by Retro Engine games Sonic games, such as as Sonic CD and Sonic Mania. It contains all of the assets for the game, such as 3D model, sprite, configuration, and scenario .BIN files.
Since RSDK archives are used for storing game assets, the files are typically only seen by gamers looking to modify the assets. These gamers use utilities, such as rsdkunpack and Sonic Mania RSDKv5 Tools, to unpack the RSDK archives.
NOTE: The Retro Engine is a game engine used by Sega to remake Sonic the Hedgehog games.
Common RSDK Filenames
Data.rsdk - Name of the RSDK archive included with the game.