This is the Window that opens when you run the Default Language command. It specifies the default language file you want to use when opening GEDCOM files.
This will not apply to Behold Organize files, which contain their own language information in them. To change the language of a Behold Organize file, open the Behold Organize file, and then first on the Organize Tags page, merge from your language file, and second on the Organize Report page, merge from your language file. Your Behold Organize file will now include the information from that language file and you can save it for easy access later.
Use the Default
This box is checked if you want to use the default English language.
A language file is a Behold Organize file that only contains the text that should be used to display GEDCOM Tags and Report information. This text is, of course, specific to the language of interest. You can think of this as a translation file.