The GeoDict Universal File (GUF) format is a generic file format that contains large amounts of data that were computed with GeoDict. Most structures and result fields in GeoDict are GUF files, e.g. *.gdt, *.vap, *.gpp, …. Using binary data avoids a loss of precision and provides efficient read and write operations.

GUF files begin with a header in text format, which (for small GUF files) can be inspected by opening the file with a text editor. The header is followed by binary data. Meta data describing the binary data is contained in the header and is line-based with pairs of key and value per line.

GeoDict provides a GUF python library in GeoPy to access GUF files without loading them to GeoDict.