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.

If you're writing a document in Microsoft Word and the worst happens, you may not have lost all of your work. Here are some steps to try and recover.

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.