When you open a file from another word processor or other program in Microsoft Word, Word will automatically use a converter, if necessary, to open the file. If Word cannot open the file, you may need to install the appropriate converter.
Verify that the converter is not already installed.
To see a list of file formats in which Word can open documents, click Open on the File menu and look at the available choices in the Files of type box.
To see a list of file formats in which Word can save documents, click Save As on the File menu and look at the available choices in the Save as type box.
Note The formats listed in the Files of type and Save as type lists are either directly supported by Word, or a converter for the format is installed.
Run the Microsoft Office Setup program.