Use MsgFilePath to set or return the full directory path to the filename.msg file. Most of the time this is the same as the source and path where the InterBase product is installed. 

This property allows you to supply your own installation messages. It is also possible to write the setup program in such a way that you could switch languages on demand, by providing several filename.msg files at different locations. 

The filename.msg file normally contains:

• Error messages
• Option names and descriptions
• Actions descriptions and status messages that are logged to the ibinstall.log file