Using Add-On Levels
Add-on levels are probably the most interesting part about Dark Forces right now, and easily the source of the most frustration. Lots of people still want to know how to use the levels they download and most text files included nowadays assume that everyone knows how to start them up already. So here I've tried to make it very simple and straightforward.
To start a level that does not contain a .bat file, place the .gob file in the Dark Forces directory and then launch the game using the following command:
dark -ufilename.gob
That means that if the name of the file is newlevel.gob and the directory for the game is c:\dark you will have the following:
c:\dark\dark -unewlevel.gob
This will start up Dark Forces and the new level will replace whichever one is specified in the text file(usually SECBASE). If the author does have a .bat file you'll still want to place all the files in the Dark Forces directory and then run the .bat. Unless the author tells you differently in the text file, this should work for almost every level you download.