If a PDF document was inserted into MS WORD with Adobe as the object type, it may not be opened with Foxit. This is not a program bug, it is happening because MS WORD remembers the default object type and persists with Adobe to open this type of file. To enable Foxit to open this type of file, do the followings:
1. In File menu, click Preferences.
2. In File Associations panel, click Advanced button.
3. Check the box next to Use Foxit Reader to open embedded Acrobat files and Foxit PhantomPDF files in Microsoft Office.
4. Click OK to apply the change.