As I recall from creating the demos, there are quite a few files which could be deleted from the final game folder to drastically cut down on disk space used.

Delete any brd*.vga or brd*.bmp files from the final game data folder. IE brdvga00.vga etc.

Also you may delete any univ??.bin or objdef??.bin files.

However, make sure you do not delete any .FCA files.

Kevin Stokes