When you attempt to open a .DOC file that came as a mail attachment in Windows Mail or Windows Live Mail, the following error may occur and the document does not open. This may happen even though you have Microsoft Word installed. Also, the same file may open correctly when saved to disk and then viewed. This article and the utility discussed below, are applicable for Windows® Vista and Windows® 7 systems with Microsoft® Word installed.
This file does not have a program associated with it for performing this action. Create an association in the Set Associations control panel.
To fix the problem, download DocFix.zip and save it to Desktop.
Unzip the contents (docfix.exe and readme.txt), and run the file DocFix.exe.
When you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Important: After running the fix, in some cases, you’ll need to open Start – Default Programs – Associate a file type or protocol… and reset .doc file type association for Microsoft Word even though it may be already associated with Microsoft Word.
If that does not fix the problem, see if repairing Microsoft Word helps.