The DLC for Wreckfest is extensive. On other platforms, there is a "Season Pass," but on Switch, content is delivered in packs. If you are searching for "Wreckfest DLC NSP," these are the major expansions you need to track (legally or via backup managers).
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Wreckfest [0100BDB012F8A000][v196608].nsp (v3 = 196608 in Switch title versioning) wreckfest rom nsp update dlc switch game new