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arc_unpacker - the visual novel extractor

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arc_unpacker is a command line tool for extracting images, sounds, music and miscellaneous resources from visual novels (and some other Japanese games).

Usage

Drag'n'drop the archive or file onto arc_unpacker. It will guess the format and unpack it for you.

Caveats:

  1. The file format might be detected by two or more decoders at once. In such cases you need to tell the program which one to use by supplying --dec=... option.

  2. The file might need more parameters to be correctly unpacked (all of which can be discovered with --help --dec=DECODER switch). In such cases you need to supply them manually. For example, XP3 archives need --plugin that tells what kind of decryption to use. To tell it to use Fate/Stay Night decryption, supply --dec=krkr/xp3 --plugin=fsn.

Q&A

  • What do I do with .wavloop files?
    These files are audio loops. You can play them like normal .wav, however, most of the players will ignore looping information that is contained in such files. If you're looking for players that do support looped .wavs, I recommend either vgmstream, foo_input_wave_loop or wavosaur. The extension .wavloop was chosen so that it stands out from normal .wavs and for compatibility with foo_input_wave_loop.

  • I drag the game files onto arc_unpacker and it immediately closes.
    Try running it from the command prompt to see the output and possible error message. Usually this behavior is a sign that the game requires additional switches which are described in the game list. If you are unfamiliar with the Windows command prompt, I recommend reading this little guide.

  • I get std::bad_alloc, what gives?
    One option is that an archive contains a very large file, which causes arc_unpacker to run out of RAM while it tries to decode that file. To circumvent this (short of buying more memory), you can try running arc_unpacker with -t=1 --no-recurse which should reduce its memory footprint. Since there only were a few such archives spotted, no special mechanism was developed to work around this issue, although this might change in the future. Other options include corrupt game files or a specific kind of bug in arc_unpacker's decoders, but both are unlikely. If you are unable to unpack the files, do not hesitate to report the issue to the issue tracker.

  • How can I help with development?
    Thanks for asking this! There are a number of ways you can help:

    • By documenting games that are already supported but are not present on the games list.
    • By porting existing decoders from other projects. Example projects can be found in THANKS.md.
    • By reverse engineering games that are not yet supported, and coding new decoders for them.

    For details, check out CONTRIBUTING.md and hit the IRC channel.

  • What's the license?
    All the code is licensed under LICENSE.md unless otherwise noted. For acknowledgments, see THANKS.md.

Contact

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