er.bdt.tool

ER.BDT.Tool is a small Windows command-line tool for unpacking BDT archives from the game Elden Ring. It is aimed at people who want to inspect or extract the game's packaged data files. Requirements: - The Oodle library oo2core_6_win64.dll, taken from the game folder and copied into the tool folder. - Microsoft .NET Framework 4.7.2. Usage is a single command: ER.Unpacker "BHD_FILE" "UNPACK_DIRECTORY" Paths containing spaces should be wrapped in double quotes. The README gives an example pointing at Data0.bhd inside a Steam Elden Ring install and an output directory. The README also lists archive coverage figures: Data0 at 4422 of 4434 (99%), Data1, Data2 and Data3 at 100%, and sd\sd at 100%. These are the author's reported extraction results, not a guarantee for every game version. Credits go to googleben for a list of missing filenames, and related Souls-format projects are linked: Atvaark's BinderTool and JKAnderson's SoulsFormats. The tool is a niche utility for game data extraction rather than a general-purpose archiver.