> For the complete documentation index, see [llms.txt](https://book.leveldesignbook.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.leveldesignbook.com/appendix/resources/formats.md).

# File formats

- [FGD file format](https://book.leveldesignbook.com/appendix/resources/formats/fgd.md): entity definition file / mapping aid for Quake-era level editors
- [MAP file format](https://book.leveldesignbook.com/appendix/resources/formats/map.md): file format spec + sample parser code for Quake .MAP files ("Valve" style, mapversion 220)
- [MDL file format](https://book.leveldesignbook.com/appendix/resources/formats/mdl.md): how to parse Quake 1 models (.MDL) and sample C source code for rendering in 3D