Open Office is a free, open-source word processing suite available for Windows, Mac OSX, Linux and Unix. The ".odt" file extension stands for "Open Document Text" and is the default file extension for the Open Office Word Processor. Open Office also supports other file formats, including the Microsoft Word format (.doc). You can use the Open Office software to convert .odt files to .doc files.
Open the Open Office Word Processor (Writer) application.
Click the "Open" icon on the toolbar. This icon looks like a yellow file folder.
Locate the ".odt" file that you want to convert and click "Open."
Choose "Save As" under the "File" menu.
Choose "Microsoft Word 97/2000/XP (.doc)" from the "File Type" drop-down menu.