The last 3 items are what need to be edited, and be sure you change the base to decimal for all the three values first.
If you, like me, are using windows 7 64 bit, the path is HKEY_LOCAL_MACHINE>SOFTWARE>Wow6432Node>Sierra On-Line>Homeworld
Also make sure you dont change the graphics settings later in the Video menu. The details can be set when you are playing the game.
Hope this helps!!
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