ODT file extension is used by
Please note that Open Document Format used in ODT files is different from "Office Open XML" which is used by Microsoft Office (.File extension docx) and "Open Document Architecture" (.File extension rdo)
File Microsoft Office doesn't provide native support and cannot open ODT files but there exists an "ODF add-in for Word". This project was originally started as Open XML translator and is currently maintained by several Microsoft partners on SourceForge.net
For more general information about files, file extensions and registry you can read one of the following articles:
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