Ive added the Hellfire expansion pack on Diable, and tried to add added quests, instructions from cheat forum below:

To obtain two additional optional character choices, the Bard, and the Barbarian, create a text file in the game's directory called "command.txt" This file should contain the word line: bardtest barbariantest
Now at the character selection screen you can choose to be a Bard or Barbarian, in addition to the other choices.






To transfer your characters from Diablo to Hellfire, find your save file and change the extension to .HSV. For example, if your file is called RASSILON.SV then rename it to RASSILON.HSV.

Ive added both text files, but nothing happens.
My question is, do I need to reinstall hellfire, and add before playing, or save the beginning of first game played, then insert command file.
And one more thing that has confused me. Do I save to Hellfire (Sierra game file). program installed in my pc, or to the game disk files? Without added quests, is a waste, exactly like original Diablo.