How to Recover an ASD File. A file with the file extension of ".ASD" is an automatically-saved backup file for a Microsoft Word 2002 or 2003 document.

Microsoft Excel has several features designed to help you recover unsaved versions of files and prevent data loss.

There's a cool trick that can help you retrieve lost and unsaved Word documents by searching for .asd in the File Explorer under My/This PC.

Want to resurrect that paragraph from a few drafts ago, or dredge up the doc you accidentally deleted? Here are your options.