How to change LibreOffice preferences to automatically save documents with Microsoft extensions (For Mac)
1. Macinotsh: Open LibreOffice, click on LibreOffice and choose Preferences
2. Double click on 
3. Click once on 
4. Under "Document Type" change the Text, Spreadsheet and Presentation document types as follows:
5. Click
button when finished.
*Note: This method is identical for OpenOffice.
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