Opening books used by computers are often in a binary undocumented format.
In addition, each application can have proprietary compressed binary format of its own.
Data may be represented in ascii or binary formats.
The resulting digital data then ends up being in offset binary format.
Due to compression, files are smaller than current binary formats.
The log files are written in a compressed binary format.
The numbers from 1 to 10 appear in binary format (the bottom row marks the beginning of each number).
However, for bulk data, binary formats can be used.
Excel's storage of numbers in binary format also affects its accuracy.
It's available for free in binary format and in source code.