Looking in the language file of DVDFab Virtual Drive, it seems to check the installed version of ImgBurn.
CAPTION=Create miniso File
ID100=Choose &source folder:
ID145=Failed to locate ImgBurn program (ImgBurn.exe)
Please choose the file manually.
Mount it now?
ID147=If you want to create .miniso file, you will need: %s or later version installed.
I guess it tells you the last message if you have version 18.104.22.168 or prior installed.