A file with the file extension of ".ASD" is an automatically-saved backup file for a Microsoft Word 2002 or 2003 document. The Microsoft Office Word application periodically backs up documents as ...

Sometimes, when you try to open a Word file it fails to open and displays the following message – Word cannot open the file because the file format does not match the file extension.

Click Cancel and Close. Open up that folder in My Computer or Windows Explorer and search for any .ASD files.