Our native file format is RTF, or Rich Text Format. We use RTF as it is compatible with just about every word processor available. The specification is published by Microsoft but it is publicly available for anyone to use so it is effectively "open".
We currently base our RTF off of the RTF Spec version 1.8, which is the version used in Word 2003 for Windows and Word 2004 for Mac. We also add a few features of our own for non-essential features. These extensions are added in the way defined by the RTF specification so our RTF files can be read by any standard RTF reader.
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