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What tromp means is that if you dump a load of .blk files onto your disk and start up Bitcoin Core, it will ask peers for block headers through the regular Bitcoin protocol (thus not relying solely on the torrent being 'legitimate') and then looks through those files to see if already has the needed blocks for those headers, before asking for them through the Bitcoin network.
I see, thanks for making it easier to understand.
I'm reaching out to address some important concerns and provide clarity about our recent initiative - a dedicated torrent for blockchain (previously referred to as Bitcoin Core).
Actually your current title is correct. File you plan to share only can be opened by Bitcoin Core (and other software which use identical file format).