Recent versions of Microsoft Word software uses .docx format for saving files. DOC format is also available, though Microsoft has been pushing hard for widespread adoption of .doc format. While technically superior, .docx causes compatibilty issues, and is generally frowned upon by those who believe “if it ain’t broken, don’t fix it”.
Docx uses compression to reduce file sizes. The problem is that users of older versions, say Office XP, cannot open docx format without installing a compatibility pack. If you send files to users of legacy software regularly, you should consider changing the default format to .doc to save yourselves time.
To change default file format
- Click Office button (located on the left top).
- Click Word Options, then “Save”.
- Click the drop down of “Save files in this format”. Select “Word 97-2003 document (*.doc)”. Hit OK to save.