Cheat Codes:
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Submitted by: Thich hiep dam

to save game in multiplayer mode, you can copy file
c:\windows\hrinfo_x.drv (x: 0,1,2,3,4….). But note: you
will lost you character if you reinstall windows. You can
rename any file c:\windows\hrinfo_x.drv to c:\windows\dlinfo_drv,
your character will appear in multiplayer mode of DIABLO
(note: before rename file, you sure that inventory of your character
is empty, and character name not same any name in DIABLO)

Hint:
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Submitted by: Thich hiep dam

Are you want to wear armo,weapon or any thing at amulet area.
Easily, if your version of hellfire has the cowboy (near cows),
you will be received a amulet by him. But before that, you have
to drop thing which you want wear at amulet area to ground.
After all, wear the amulet and NEWGAME.

More money:
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Fill all but one of the spaces in your inventory with
items (such as health and mana potions). Place 1 gold
piece in the remaining free square. Have 5,000 gold on
the ground, ready to be picked up. Make sure your
inventory is not displayed on the screen, then pick up
the money. Your character will state that he or she can
not carry any more. The 1 gold piece in your inventory
should now be changed to 5,000, with the other gold
remaining on the ground. Repeat this process to get
as much gold as needed.

Bonus Quests and Character Class
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The following code requires the latest version of
Diablo: Hellfire. It will not work on the original
version.
To access some secret Easter eggs in Hellfire, create
a text file called command.txt and place it in your
Hellfire directory. Next, place the following line
in command.txt:

multitest;cowquest;theoquest;bardtest

You can get a new character,The Bard.

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in the command.txt add: barbariantest it will add another
new class, the barbarian. he reuses warrior artwork
and has max strength of 270
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This enables LAN and modem games, two new quests
(Cow Quest and Theo Quest), and two new character classes:

The Bard reuses the Rogue’s art, but can wield two weapons
at once and has the Identify spell as her natural ability.

Transfer Characters from Diablo
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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.
References :
cheatbook database