LEGO Island Decompilation Development Vlog has successfully decompiled ISLE.EXE and LEGO1.DLL, aiming for accuracy by matching recompiled instructions to the original machine code. While ongoing work is focused on improving accuracy, naming, and structure, the source code allows for modifications, improvements, and porting to other platforms. Using the CMake build system and Microsoft Visual C++ 4.20, this project guides contributors on compiling highly-accurate binaries for functional gameplay. The project highlights the complexity of reproducing the original executables precisely, but remains optimistic for future solutions. Controversially, the decompilation targets the English release of version 1.1 of LEGO Island specifically, despite small changes in other localized versions.
https://github.com/isledecomp/isle