1. File Formats in Fallout 1 and Fallout 2
Here is a listing of all the file formats used in the games. The formats are organised according to the format of the data inside the file, not the file extension. For example, combat.bio (which describes the biography of a premade character), is of format type Raw text. This is because the contents of the file are simply raw text, which must follow certain rules (such as line length). Where particular files must follow certain rules, these files will be listed in the exceptions section.
1.1. Formats yet to be documented
| Format | Description |
| ACM | Compressed audio |
| FON | Font file |
| GAM | Script variables |
| GCD | Gurps Character Data |
| INT | Script file |
| LBM | Image file used by Mapper |
| LIP | Lip synchronisation for talking heads |
| MSG | Message data used in scripts |
| MSK | World Map mask |
| MVE | Interplay Movie file |
| PAL | Palette used for FRM files |
| PRO | Object Prototypes |
| Save Game | Save Game |
| SDF | Recording |
| Tile Patterns | Tile patterns used by Mapper |
| VCR | Recording |
1.2. Documented formats
These formats are not all necessary complete, and will contain fields for which the meaning is unknown. If you discover the meaning of an unknown field, then please let me know.
