1. The keyboard command for saving a file in Microsoft Word is Ctrl + S.
2. Two referencing software used for citations are Zotero and EndNote. Both help manage and format citations efficiently.
3. Yes, deleted files can potentially be recovered using file recovery software or by restoring from backups.
4. Two advantages of LaTeX over Microsoft Word are: better handling of complex mathematical equations, and superior control over document layout and formatting.
5. The extension for a PowerPoint file is .pptx.
6. The keyboard shortcut for justifying the text paragraph in Microsoft Word is Ctrl + J.