For sensitive information contained in Word documents to be opened in VFP, it is sometimes acceptable to rename the extension of the document, in order to prevent it from being opened outside of FoxPro. There are two possible solutions to then open the document in VFP.
Renaming the document "on-the-fly" in VFP, but this solution is dangerous. If the application crashes, the document then remains renamed, an is exposed to abuse.
The second solution is to force the "Open with..." dialog from windows if the extension of the document is not recognized by Windows.