AssetStudio has been discontinued. Similar apps include GARbro, which is free and open source. Other options are UndertaleModTool, FModel and Dragon UnPACKer. In total there are four File Archivers like AssetStudio for Windows, Linux and Mac.
A resource browser, archiver, and extractor specializing in game data archives. It handles uncommon file formats not supported by standard zip and rar utilities. A full list of supported formats can be found at https://morkt.github.io/GARbro/supported.html.
The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!)
FModel is an archive explorer for Unreal Engine games that uses CUE4Parse as its core parsing library, providing robust support for the latest UE4 and UE5 archive formats. It aims to deliver a modern and intuitive user interface, powerful features, and a comprehensive set of...
This program allow you to open the game resource files in an explorer-like interface then extract the content at will. More than 80 games are supported directly. It is plugin based making easier to add new archive file formats.
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