What is the BIF file format?
A .bif file is a BIFF archive - the primary resource container used in BioWare's Infinity Engine games (*Baldur's Gate*, *Baldur's Gate II*, *Icewind Dale*, *Planescape: Torment*) and later in the Aurora Engine (*Neverwinter Nights*). Every game resource - area layouts, 2DA tables, scripts, textures, sounds - is packed inside one or more .bif files on the game disc or installation.
.bif files never work alone. They are always paired with a .key index file that maps resource names and numeric type codes to their containing BIF and byte offset. The .key is the catalog; the .bif files are the shelves. Resource types are identified by numeric codes rather than extensions: 0x0003 = TGA texture, 0x0004 = WAV audio, 0x03ED = area file.
The format uses a compact 20-byte header followed by a file-entry table and raw data blocks. BIF V1 stores resources uncompressed; the compressed variant BIFCV1.0 applies zlib compression per entry. The Aurora Engine introduced KEY BIF V1.1 with minor structural changes for *Neverwinter Nights*.
.bif files can be inspected and extracted with tools such as NearInfinity, WinBIF, or BIFRip. The format was superseded by ERF (Encapsulated Resource File) in *Dragon Age: Origins* and *Neverwinter Nights 2*. Note that .bif is also used by Roku for Base Index Frame thumbnail data - a completely unrelated format sharing only the extension.
Security & safety
RISK: LOWBIF files are passive data archives from game installations; they cannot execute and pose no meaningful risk. Modded BIF files from untrusted sources could contain altered game scripts, but not arbitrary code execution.
Format details
in a nutshell- TomTom Navigator Information File - Plain-text config/info file used by TomTom GPS devices storing map activation, credentials, or device settings.
- Roku Base Index Frames (BIF) - Binary image archive used by Roku streaming players to display thumbnail previews during video trick-play (fast-forward/rewind); entirely unrelated to BioWare format.
Programs that open BIF files
Windows3 apps
macOS1 app
Linux1 app
Technical details
deep spec| Byte order | Little-endian |
| Magic bytes | BIFFV1 (8 bytes) for Infinity Engine; BIFCV1.0 for compressed variant; KEY BIF V1.1 for Aurora Engine |
| Header size | 20 bytes |
| Resource type encoding | Numeric type codes (not extensions): e.g. 0x0003=TGA, 0x0004=WAV, 0x03ED=ARE |
| Compression | None in BIF V1.0; zlib per-entry in BIFCV1.0 |
| Dependency | Always paired with a .key index file for resource name resolution |
| Max resource count | 16-bit count field in header |
| Typical file size | 2 MB - 600 MB |
| Format versions | BIF V1.0 (Infinity Engine, 1998); BIFCV1.0 (compressed); KEY BIF V1.1 (Aurora/NWN, 2002) |
| Superseded by | ERF (Encapsulated Resource File) in NWN2 and Dragon Age: Origins |
| Modding tools | NearInfinity, WinBIF, BIFRip |
| Released | 1998 (Baldur's Gate) |
| Latest version | BIF V1.1 (Aurora Engine, 2002+); BIFCV1.0 (compressed variant) |
| Specification | gibberlings3.github.io |
BIF conversions
Community Q&A
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