The wrong program opens when Marvin double-clicks a .docx file. He asked the Answer Line forum how to fix this.
Windows can associate multiple programs with various file extensions (.docx, .jpg, and so on), with only one program being the default application--the one that opens when you double-click the file. Somehow, on your PC, Windows has the wrong program associated with that particular file type.
And believe me, you don't want your files associating with the wrong type of application.
The instructions below work in Windows 7, Vista, and XP. The exact wording of the menu options and prompts varies between these three Windows versions, but they're close enough.
Right-click a file of with the badly-associated extension and select Open with, then Choose default program. Make sure Always use the selected program to open this kind of file is checked. Double-click your program of choice or click Browse to find something else.
This will open the file in the program you selected. More importantly, double-clicking any file with that extension will open it in this program from here on in.
Read the original forum discussion.