AbiWord Document (.abw)
The ABW file extension stands for AbiWord Document, a word-processing file format used by the open-source AbiWord software. Developed by the AbiSource community, ABW files support formatted text, images, tables, lists, and footnotes. Originally popular for its cross-platform compatibility, AbiWord has since focused on Linux. ABW files are based on XML, allowing them to be opened with various text editors, though best viewed with AbiWord.