GMA Filetype Breakdown
TPL Filetype Breakdown
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You can find information related to the ARC (U8) format elsewhere, but I find the explanations quite trite compared to visual examples. The format itself is very simple. While F-Zero GX uses it for JPEG Sequences and storing TPL files, the format is capable of storing (I would assume) any file format. If you want more info, go here: U8 File Format.
