File preferences control how you save matches that you play or watch. Matches are stored in text files that can be opened in BGBlitz, gnubg, or other backgammon software to replay and analyze the match.
If you want to save every match you play, choose "Always" from the popup menu. If you don't want to save your matches, choose "Never" (this is the default). The "Ask" choice allows you to decide after each match whether you want to save that particular match.
The same options applied to matches you watch.
Saving files with an extension of ".txt" makes it easier to open the files in text editors or other software. Saving files with an extension of ".mat" may make it easier to open the files in backgammon specific software, especially if you exchange match files with Windows users.
Choose the folder in which to store match files.