AdvSys is an Interactive Fiction development system written by David Betts. AdvSys source code files can be created using a plain text editor, and then compiled into a system-independent game file that can be run on any platform with an appropriate AdvSys interpreter.
- .DAT: a compiled AdvSys game file
- .ADV: the main source code module for an AdvSys game
AdvSys source code files can have any (or no) extension. The source code files for a given game are defined in the .ADV file.
- busted.dat: Busted!, by Jon Drukman
- elves87.zip: Elves '87, by Bruce MacKay and Marlene Abriel. Compiled game file and source code included. File is a ZIP archive.