this post was submitted on 02 Jun 2024
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So the first file acts as a sort of index? From the earlier comment I thought it was autodetecting the presence of the numbered files and expanding what it found.
It's going to have some metadata to that effect yes, like a file index or number of parts or total extracted file size. I don't know the details, I've used them I haven't read the spec. rar is Rarlab's proprietary format so there might not even be a public spec.
They're normally all the same size except for the last part, so it's not that file 1 is just an index.