Attempting to re-create / replicate an archive made years ago with an unknown application, which is no longer complete on a file-sharing network

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  • precomp-cpp

    Precomp, C++ version - further compress already compressed files Maybe some tools posted in Maybe something has to be developed specifically for your task.

  • XADMaster

    Objective-C library for archive and file unarchiving and extraction

    Rar would compress them with plain LZ, there's nothing special for jpegs there. However Winzip has a special codec for jpegs - that could be a problem.

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  • xdelta

    open-source binary diff, delta/differential compression tools, VCDIFF/RFC 3284 delta compression

  • HDiffPatch

    a C\C++ library and command-line tools for Diff & Patch between binary files or directories(folder); cross-platform; run fast; create small delta/differential; support large files and limit memory requires when diff & patch.

    I'd suggest to just try other diff programs, eg.

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