| Extension Name | Extension Type | Category | Dev.Company | File Format |
|---|---|---|---|---|
| .ARC File Extension | Nintendo Archive File | Data | Nintendo | Binary |
| .ARC.LH File Extension | Nintendo Archive File | Data | Nintendo | Unknown |
| .CARC File Extension | Nintendo DS Compressed Archive File | Game | Nintendo | Binary |
| .DOL File Extension | GameCube Executable File | Game | Nintendo | Binary |
| .ELF File Extension | Nintendo Wii Game File | Executable | Nintendo | Binary |
| .GCM File Extension | GameCube ROM | Game | Nintendo | Binary |
| .KCL File Extension | Mario Kart Collision File | Game | Nintendo | Binary |
| .KMP File Extension | Mario Kart Wii Course Description File | Game | Nintendo | Unknown |
| .MII File Extension | Wii Virtual Avatar File | Game | Nintendo | Binary |
| .NARC File Extension | Nintendo DS Archive File | Game | Nintendo | Binary |
| .NKM File Extension | Mario Kart DS Track Data File | Game | Nintendo | Binary |
| .NCGR File Extension | Nintendo DS Title Graphics File | Game | Nintendo | Binary |
| .NSCR File Extension | Nintendo DS Title Screen File | Game | Nintendo | Binary |
| .NCLR File Extension | Nintendo DS Color Palette File | Game | Nintendo | Binary |
| .REL File Extension | Relocatable Module File | Game | Nintendo | Unknown |
| .RKG File Extension | Mario Kart Wii Ghost Data File | Game | Nintendo | Unknown |
| .SAV File Extension | Nintendo DS Save File | Game | Nintendo | Binary |
| .SDAT File Extension | Nintendo DS Sound Data File | Audio | Nintendo | Binary |
| .SSEQ File Extension | Nintendo DS Sound File | Audio | Nintendo | Binary |
| .SPA File Extension | Nintendo DS Particle File | Game | Nintendo | Unknown |
| .TPL File Extension | Wii Image File | Game | Nintendo | Unknown |
| .WAD File Extension | Nintendo Wii Game Data File | Game | Nintendo | Binary |
| .BMD File Extension | GameCube 3D Model File | Game | Nintendo | Binary |
| .BTI File Extension | Nintendo Texture File | Raster Image | Nintendo | Binary |
| .BMG File Extension | Nintendo DS On-Screen Text File | Game | Nintendo | Binary |
| .GCI File Extension | GameCube Save File | Game | Nintendo | Unknown |
| .MSBT File Extension | Nintendo Wii Galaxy Dialogue File | Game | Nintendo | Unknown |