init

runtime/assets/wii/README.md

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+# Wii first-run bootstrap payload
+
+This directory contains the small `shared2/wc24` first-run tree needed when Mario
+Kart Wii is launched directly without an imported Wii NAND. The runtime copies
+these files only into a newly managed, per-user NAND and never overwrites an
+existing profile.
+
+The layout and required files follow Dolphin's direct-disc Wii bootstrap:
+`Source/Core/Core/WiiRoot.cpp` and `Data/Sys/Wii/shared2/wc24`.

runtime/assets/wii/shared2/wc24/mbox/Readme.txt

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+The Mailbox here has been shrunk, the real file size:
+
+WC24RECV.MBX	0x00700000
+WC24SEND.MBX	0x00200000