Document.EmbedLinguisticData (Word)

True for Microsoft Word to embed speech and handwriting so that data can be converted back to speech or handwriting.

The EmbedLinguisticData property also allows you to store East Asian IME keystrokes to improve correction and controls text service data received from devices connected to Microsoft Office using the Windows Text Service Framework Application Programming Interface

Sub EmbedSpeechHandwriting() 
 ActiveDocument.EmbedLinguisticData = True 
End Sub