There is only one file type that uses the .ODI extension:
Image document created using the OASIS OpenDocument standard; contains the image graphics as well as XML-based definitions that describe the layout of the image; used for storing, exporting, and importing images in a standard format.
ODI files are saved as compressed Zip archives that may contain multiple XML files and other asset files.
NOTE: OpenOffice is a free office productivity suite that implements the OpenDocument standard. It was previously known as StarOffice.
Updated: May 2, 2014