#Self-executable WAD file containing the DOOM.EXE binary

This is a silly idea, sparked by a tweet and encouraged by the one and only polyglot file god: Ange Albertini

#errr ok... what do I need to try this?

• The shareware Doom (go find doom19s.zip), unzipped below this folder
• Dosbox (standard package or debug build)
• faucc 16-bit compiler (standard package in Deb/Ubuntu)
• gcc 32-bit compiler and build-essentials tooling (make)
• Lunacy.

#How do I try this?

• You should be able to run make test and it all just works..

#How does this work?

• There are three stages involved:
  • Packing new lumps (unpacker, DOOM.EXE) into the WAD: This is done by wadinject, an un-surprising command line C program, which emits the new WAD as an MS-DOS .COM program.
  • Unpacking DOOM.EXE from the self-executable WAD/.COM: This is done by a 16bit COM program stub that forms part of the WAD itself (and where the polyglot magic happens).
  • Renaming the .COM back to .WAD (or DOOM doesn't work), then launching the unpacked DOOM.EXE (now D.EXE).

#Are there binaries?

Yep - check the releases folder...