one more thing, maybe the problem is the SAPI version. try to install Microsoft Speech SDK 5.1 that was used when creating the project
Viewing post in TextGameCreation (Text Based Game Editor) v6.5 comments
SDK 5.1 .msi file is in the project archive or download it from here:
https://www.microsoft.com/en-us/download/details.aspx?id=10121